This falls under the heading of “can’t she just throw some things away?” If you are a regular reader, then you know the answer to that question is no.
To make paint pots for my toddler, I started with a mixed match assortment of empty plastic containers and then cut a hole in the lid:
I poured a little washable paint in the containers, put the lids on, and let my son go to town: If the paint pot tips over, the lipped lid prevents the paint from running all over the place.
I use an old salad container to hold all of the paint pots:
I don’t empty the paint out of the pots; I just let them slowly dry out inside the salad container. Since the paint is water based, I just add a little water and mix it in with a paint brush when he wants to paint.
How do you minimize arts and craft messes with your children?