For "Eyes that Follow" Instructable. Lights up 10 NeoPixels the color red with an Adafruit Gemma.

EyesBacklighting.ino

#include <Adafruit_NeoPixel.h>

#define NUM_LEDS 10
#define PIN 0

Adafruit_NeoPixel strip = Adafruit_NeoPixel(NUM_LEDS, PIN, NEO_GRB + NEO_KHZ800);

void setup() {
  strip.begin();
  setAll(strip.Color(255, 0, 0));
  strip.show();
}

void loop() { 
}

void setAll(uint32_t theColor) {
  for(uint16_t i = 0; i < strip.numPixels(); i++) {
    strip.setPixelColor(i, theColor);
  }
}