i have cans just underneath my desk that are empty, as for scrap and full cans, those stay in my back pack. Markers just stay on my desk, to my parents they're just legal art supplies.
A good spot to hide anything (including cans) is to lift your mattress up, rip or cut a hole or line in the lining of your box spring, stash, then replace your mattress. It won't work for the feds but if you are just trying to hide your supplies from household members (unaccepting parents for example).