I bought KidPix for my school and the computer teacher for Kindergarten
is teaching using the mouse to draw the letter and then draw the thing which
begins with the letter. However, you might ask the third and second graders
to show a landscape showing overlapping, gradual greying of tones from front
to back and also showing how small things are in the distance compared to up
front. I showed a video named "Hot Air Henry" a Reading Rainbow video and
they had to show overlapping with black magic markers and then color it with
crayons. An extension might be to draw this using the mouse on KidPix.