Valentine's Day Neopixel/LED Heart

All you need is to print the base in whatever filament color you like and print the lens in white. Place the LED strip against the wall and glue it down if it's not adhesive backed.

Easy install- 

Neopixels https://www.amazon.com/

WS2812B controller

5V 2Amp Power supply

The “I like to code myself” install-

Attiny85 https://www.amazon.com/

5V 2Amp power supply https://www.amazon.com/

The code I use ArduinoIDE and I love to use the Adafruit libraries.  https://www.adafruit.com 

// NEOPIXEL BEST PRACTICES for most reliable operation:
// - Add 1000 uF CAPACITOR between NeoPixel strip's + and - connections.
// - MINIMIZE WIRING LENGTH between microcontroller board and first pixel.
// - NeoPixel strip's DATA-IN should pass through a 300-500 OHM RESISTOR.
// - AVOID connecting NeoPixels on a LIVE CIRCUIT. If you must, ALWAYS
//   connect GROUND (-) first, then +, then data.
// - When using a 3.3V microcontroller with a 5V-powered NeoPixel strip,
//   a LOGIC-LEVEL CONVERTER on the data line is STRONGLY RECOMMENDED.
// (Skipping these may work OK on your workbench but can fail in the field)
#include <Adafruit_NeoPixel.h>
#ifdef __AVR__
#include <avr/power.h> // Required for 16 MHz Adafruit Trinket
#endif
// Which pin on the Arduino is connected to the NeoPixels?
// On a Trinket or Gemma we suggest changing this to 1:
#define LED_PIN    3
// How many NeoPixels are attached to the Arduino?
#define LED_COUNT 72
// Declare our NeoPixel strip object:
Adafruit_NeoPixel strip(LED_COUNT, LED_PIN, NEO_GRB + NEO_KHZ800);
// Argument 1 = Number of pixels in NeoPixel strip
// Argument 2 = Arduino pin number (most are valid)
// Argument 3 = Pixel type flags, add together as needed:
//   NEO_KHZ800  800 KHz bitstream (most NeoPixel products w/WS2812 LEDs)
//   NEO_KHZ400  400 KHz (classic 'v1' (not v2) FLORA pixels, WS2811 drivers)
//   NEO_GRB     Pixels are wired for GRB bitstream (most NeoPixel products)
//   NEO_RGB     Pixels are wired for RGB bitstream (v1 FLORA pixels, not v2)
//   NEO_RGBW    Pixels are wired for RGBW bitstream (NeoPixel RGBW products)

// setup() function -- runs once at startup --------------------------------
void setup() {
 // These lines are specifically to support the Adafruit Trinket 5V 16 MHz.
 // Any other board, you can remove this part (but no harm leaving it):
#if defined(__AVR_ATtiny85__) && (F_CPU == 16000000)
 clock_prescale_set(clock_div_1);
#endif
 // END of Trinket-specific code.
 strip.begin();           // INITIALIZE NeoPixel strip object (REQUIRED)
 strip.show();            // Turn OFF all pixels ASAP
 strip.setBrightness(50); // Set BRIGHTNESS to about 1/5 (max = 255)
}

// loop() function -- runs repeatedly as long as board is on ---------------
void loop() {
 // Fill along the length of the strip in various colors...
 colorWipe(strip.Color(255,   0,   0), 50); // Red
 colorWipe(strip.Color(  255, 255,   255), 50); // white
 colorWipe(strip.Color(  255,   0, 0), 50); // red
  colorFade(strip.Color(235, 52, 232), 10); // Red
 theaterChase(strip.Color(255, 0, 0), 50); // red, half brightness
 theaterChase(strip.Color(235, 52, 232), 50); // Pink, half brightness
 theaterChase(strip.Color(  255,   0, 0), 50); // red, half brightness
rainbow(10);
}

// Some functions of our own for creating animated effects -----------------
// Fill strip pixels one after another with a color. Strip is NOT cleared
// first; anything there will be covered pixel by pixel. Pass in color
// (as a single 'packed' 32-bit value, which you can get by calling
// strip.Color(red, green, blue) as shown in the loop() function above),
// and a delay time (in milliseconds) between pixels.
void colorWipe(uint32_t color, int wait) {
 for(int i=0; i<strip.numPixels(); i++) { // For each pixel in strip...
   strip.setPixelColor(i, color);         //  Set pixel's color (in RAM)
   strip.show();                          //  Update strip to match
   delay(wait);                           //  Pause for a moment
 }
}
void colorFade(uint32_t c, uint8_t wait) {
for(int j=255; j>=0; j--) {
for(uint16_t i=0; i<strip.numPixels(); i++) {
strip.setPixelColor(i, strip.Color(j, 0, 0));
}
strip.show();
delay(wait);
}
}

// Theater-marquee-style chasing lights. Pass in a color (32-bit value,
// a la strip.Color(r,g,b) as mentioned above), and a delay time (in ms)
// between frames.
void theaterChase(uint32_t color, int wait) {
 for(int a=0; a<10; a++) {  // Repeat 10 times...
   for(int b=0; b<3; b++) { //  'b' counts from 0 to 2...
     strip.clear();         //   Set all pixels in RAM to 0 (off)
     // 'c' counts up from 'b' to end of strip in steps of 3...
     for(int c=b; c<strip.numPixels(); c += 3) {
       strip.setPixelColor(c, color); // Set pixel 'c' to value 'color'
     }
     strip.show(); // Update strip with new contents
     delay(wait);  // Pause for a moment
   }
 }
}
// Rainbow cycle along whole strip. Pass delay time (in ms) between frames.
void rainbow(int wait) {
 // Hue of first pixel runs 3 complete loops through the color wheel.
 // Color wheel has a range of 65536 but it's OK if we roll over, so
 // just count from 0 to 3*65536. Adding 256 to firstPixelHue each time
 // means we'll make 3*65536/256 = 768 passes through this outer loop:
 for(long firstPixelHue = 0; firstPixelHue < 3*65536; firstPixelHue += 256) {
   for(int i=0; i<strip.numPixels(); i++) { // For each pixel in strip...
     // Offset pixel hue by an amount to make one full revolution of the
     // color wheel (range of 65536) along the length of the strip
     // (strip.numPixels() steps):
     int pixelHue = firstPixelHue + (i * 65536L / strip.numPixels());
     // strip.ColorHSV() can take 1 or 3 arguments: a hue (0 to 65535) or
     // optionally add saturation and value (brightness) (each 0 to 255).
     // Here we're using just the single-argument hue variant. The result
     // is passed through strip.gamma32() to provide 'truer' colors
     // before assigning to each pixel:
     strip.setPixelColor(i, strip.gamma32(strip.ColorHSV(pixelHue)));
   }
   strip.show(); // Update strip with new contents
   delay(wait);  // Pause for a moment
 }
}