BusinessSpanish.com
Business spanish.com: Colors/colores
From primary to secondary, this site has great colors that are translated from Spanish to English. You can also hear the pronunciation by clicking on the color you want to hear. Bilingual.
TESL Journal
Activities for Esl Students: Colors: Sentence Completion
At this site complete ten sentences with the appropriate color. Context gives clues about the correct color. Designed for ESL students.