you can use anything. i used to use, you know pencil tins? so a metal tin that pencils come in. they rust abit EVENTUALLY so i switched to these plastic stationary cases. They were like 2 dollars each. a roll of baking paper from the kitchen and plain coloured paper towel under. basically like 10 dollars of material for endless wet pallettes. i also got a $1 squeeze bottle for the water so i just squeeze it in there.

You can see these are jusr A4 paper cases. they are thin and stack great. easy to clean. fairly big.
if you don't want them TOOOO wet. you just crank the lid open a little big so SOME air flow.

Here you can see i just stack them up.

Lol about the film... I think yo got the mood of the picture JUST right... lol :-) love the dress she is wearing. :-)