How about a mosaic - you could use the crayons end up, or side down. It
could be for the 'design' or pattern more than a picture - it could be the
end of the year and use all of the marker caps from old markers, tape
spools, caps from paint... I have a wall hanging in the room of the bottoms
of old paint (yogurt cups, jar lids) cups (with the dried paint)... I liked
Each child could do a 'crayon collage' on mat board.
Color wheels with the pieces (along with a 'colored in' swatch).
Crayon shavings on bisque ware, then baked and polished?
Can you drill holes in them and string them like beads? .... I better go,
I'm getting carried away.................