i've done a few things with my middle schoolers. for example: blind contour
is fun, i draw my hand without looking and then have them do it. wonderful
results if they are paying attention (perception) and not cheating, have them
tape their paper down first. the other from drawing on the right side is the
upside down drawing.... i have used picasso's stravinsky, but there are other
images that work. look for clean detailed line drawings.