If you’re an avid watcher of Debi’s videos then you have probably seen the one where she puts paint in the freezer to thicken it up. She uses a number of tools in that video to create a funky layered paint effect, including this set of specialty sponges.
Smaller one: 2 1/4 x 2 1/2″
Large one: 3 1/4 x 3″
See second pic for size comparison to a quarter. You can watch Debi’s video here on YouTube