Tempera paint. And paper scraps. And scissors. And the weird junk people bring me. "...but I'll use it SOME DAY...
Paint- But what I am envious is how tidy your cupboard is- I do need about a week to get my store room , kiln room and art room clean and tidy- there just is never enough time to do it all.
Containers. Like Gerber Puffs containers or Crystal Light containers- those are my favorites. I am always collecting empty containers as if I'm going to have tons of stuff to store someday! Sometimes I use them but mostly they sit in the cabinets or in boxes or inside of other containers :)
Paint..definately. I have a cupboard that looks like yours and have a huge box underneath a table filled with more! (I think I must have 15 bottles of each color! I also have at least 1,000 (ok, slight exaggeration!) egg cartons. I asked for them once, and they just keep coming in...and paper bags and large yogurt containers.I obviously need professional help!
Paper -- drawing paper, watercolor paper, construction paper... one can never have too much paper! but dont worry ... once my clay is in i will probably start on the glaze too.
I feel like I never have enough paper!
Mine is recycle-able stuff!! I have an endless supply of stuff we could turn into something one day!!