at the daycare i worked at we kept cans all year round for mothersday tomato plants to give to moms and grandmas. like @GlitterQueen pic the kid would get to plant the tomato plant and paint the can and we would glue a picture of the kid on the can.
another one i have see is the lanterns that @mommyDearest showed, they are reallllly cute
you can use them to hold 'randoms' in your pantry like seasoning packets, or wrap them in ribbon and put sugar /creamer/ stirrers packets in them for parties. a gf uses them in her craft bag, and kids glue stuff ot them and use them as pencil holders.
if any of you watched the show make room for baby on discovery health, they glued a bunch together to look like castle towers, and made a 3D wall art thing. it was cute!!!