This was our project for yesterday: a reintroduction to shaving cream, very possibly Maia's favorite art material ever.
In the past, I've manned the shaving cream dispenser, squirting the stuff wherever she asked. But this time she insisted on doing it herself. It's hard work as you can see on her face! But oh so satisfying. Good thing I bought the super cheapy stuff, because she emptied the canister.
I set out some tempera paint and she mixed and mushed it around with the shaving cream using her hands half the time and her paint brush the other half.
I know you're thinking that this looks like the messiest possible art project, but it's actually super easy to clean up because of the shaving cream. You could do this at the kitchen table (or kitchen floor) if you don't have a dedicated art space. Or outside when it's warmer. Or even in the bathtub (make sure you have a good nonslip mat!).
By the way, I've starting working on my "project a day" list and will share it with you once I've finished putting it together. So far it's heavy on the art projects (big surprise) but also includes cooking, excursions, and nature activities.