English Club
English Club: Learn English: Learn About Colors
Examples of sixteen different color words. Pictures and audio pronunciation for each color as well as sentences with some colors are provided.
Quizlet
Quizlet: Kindergarten
Kindergarten flash cards that have words and names with questions and some pictures on the flip sides.
TESL Journal
The Internet Tesl Journal: Crossword Puzzle Colors
This site has a crossword that focuses on color words that the solver must supply. There's a hint button available as well.