Colors

http://www.spanishtown.ca/spanishforkids/grade1/monthlyvocabulary/month1activities/audio-colores.htm

Quiz for 5+
http://www.quiz-tree.com/Spanish-Vocabulary_Colors_1_MC-4.html

Another Quiz for ages 5+
http://www.quiz-tree.com/Spanish-Vocabulary_Colors_2_MC-4.html

Color Game
http://www.learn4good.com/kids/learning_spanish_online/interactive_flash_lessons_for_children/color_words.htm