boatcolor.c

#include <FastLED.h>

#define DATA_PIN    5
#define LED_TYPE    WS2812
#define COLOR_ORDER GRB
#define NUM_LEDS    480
CRGB leds[NUM_LEDS];

int pos = 0;

void setup() {
  FastLED.addLeds<LED_TYPE,DATA_PIN,COLOR_ORDER>(leds, NUM_LEDS).setCorrection(TypicalLEDStrip);
  FastLED.setBrightness(128);
}

void loop() {
  FastLED.show();  
  tinsel(2, 10);
}

void tinsel(int density, int fade) {
  fadeToBlackBy(leds, NUM_LEDS, fade);
  for (int i = 0; i < density; i++) {
    // Red
    pos = random16(NUM_LEDS / 2);
    leds[pos] += CHSV(0 + random8(48), 160 + random8(64), 255);

    // Green
    pos = random16(NUM_LEDS / 2) + NUM_LEDS / 2;
    leds[pos] += CHSV(72 + random8(48), 160 + random8(64), 255);
  }
}