I'm sure I'm not the first person who has ever thought of this, but my mom thought it was really great and wasn't something she'd done before (and I have 5 siblings), so I'd thought I'd put it up here.
Mim is big into hopping these days, as well as shapes and colors. So now when we go outside to do sidewalk chalk, it turns into a learning game where I draw a bunch of different shapes on the patio and then ask her to jump (or stomp, or stand on one leg on) the shape I name. It's really fun. We've tried it with letters and numbers before, as well (she didn't like that as much as just the shapes or colors).
Here's what I mean: