Using modelling clay that my husband found at a dollar store, we've been outside numerous times, having fun learning how to make pinch pots and worms/snakes and all kinds of things.
Talia has a great time getting messy and playing with the clay, then leaving it to dry. But heaven forbid a bee or similar-looking insect pay a visit to the backyard while she's busy with her artwork! (She fer-reaks out, and wants to come inside immediately!) lol :)