http://www.kinderart.com/painting/emotion.shtml
on this page you will find interesting art lesson plans, you can practice vocabulary, too.
Here is an example from that page:
Vocabulary:
image, feeling, emotion, idea, expression, color, texture, line, imagine, create, change, evolve, happy, sad, angry, excited, alone, bright, dull, acrylic, tempera, experience, share, design
