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I first looked around Instructables to find inspiration on how I wanted to do my mood lamp. I was then inspired by this post on Instructables.

I decided to do a mood lamp where the light can shine onto the wall to give a nice light projection from the shape of the frame. I then tweaked the design by changing the shape of the top, which then I decided to do a heart shape top as I thought it would be nice to have a heart shape projection on the wall.

My product makes use of a button as a input device and the LED strip as an output device. Working with the LED strip was relatively simple and easy to operate. On the right was how I connected the button and the LED strip to the Arduino UNO and the breadboard.

 #include < Adafruit_NeoPixel.h >
#ifdef __AVR__
 #include < avr/power.h > // Required for 16 MHz Adafruit Trinket
#endif

#define BUTTON_PIN   2

#define PIXEL_PIN    9  // Digital IO pin connected to the NeoPixels.

#define PIXEL_COUNT 15  // Number of NeoPixels

Adafruit_NeoPixel strip(PIXEL_COUNT, PIXEL_PIN, NEO_GRB + NEO_KHZ800);

boolean oldState = HIGH;
int     mode     = 0;    // Currently-active animation mode, 0-9

void setup() {
  pinMode(BUTTON_PIN, INPUT_PULLUP);
  strip.begin(); // Initialize NeoPixel strip object (REQUIRED)
  strip.show();  // Initialize all pixels to 'off'
}

void loop() {
  // Get current button state.
  boolean newState = digitalRead(BUTTON_PIN);

  // Check if state changed from high to low (button press).
  if((newState == LOW) && (oldState == HIGH)) {
    // Short delay to debounce button.
    delay(20);
    // Check if button is still low after debounce.
    newState = digitalRead(BUTTON_PIN);
    if(newState == LOW) {      // Yes, still low
      if(++mode > 8) mode = 0; // Advance to next mode, wrap around after #12 
      switch(mode) {           // Start the new animation...
        case 0:
          colorWipe(strip.Color(  0,   0,   0), 50);    // Black/off
          break;
        case 1:
          colorWipe(strip.Color(255,   0,   0), 50);    // Red
          break;
        case 2:
          colorWipe(strip.Color(  255,   0, 255), 50);    // Magenta
          break;
        case 3:
          colorWipe(strip.Color(128, 0, 255), 50); // Violet
          break;
        case 4:
          colorWipe(strip.Color(0,   0,   255), 50); // Blue
          break;
        case 5:
          colorWipe(strip.Color(  0,   255, 255), 50); // Cyan
          break;
        case 6:
          colorWipe(strip.Color(  0,   255, 128), 50); // Spring Green
          break;
        case 7:
          colorWipe(strip.Color(  255,   128, 0), 50); // Orange
          break;
        case 8:
          rainbow(10);
          break;
        
      }
    }
  }

  // Set the last-read button state to the old state.
  oldState = newState;
}

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 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
    }
  }
}

void rainbow(int wait) {
  for(long firstPixelHue = 0; firstPixelHue < 3*65536; firstPixelHue += 256) {
    for(int i=0; i< strip.numPixels(); i++) { // For each pixel in strip...
      int pixelHue = firstPixelHue + (i * 65536L / strip.numPixels());
      strip.setPixelColor(i, strip.gamma32(strip.ColorHSV(pixelHue)));
    }
    strip.show(); // Update strip with new contents
    delay(wait);  // Pause for a moment
  }
}

Below, you can view how the light looks like when being light up. You can see that it creates a light pattern on the wall.