I recently was in thrift store and found a salad spinner for $2. I've been looking for one for a while now, but they are hard to find. I think I saw one in a retail store for $30.
I followed these instruction to create some fun art. My daughter really enjoyed spinning and squirting paint. It's really fun and easy to do. And I didn't find it that messy (at least compared to a toddler who will paint with her fingers for 20 minutes or longer).