This soddy creature makes a fun first-time gardening project while bringing a little bit of spring into your home.
Combine the potting soil and grass seed in a large bowl.

Cut the bottom from a small yogurt container or paper cup for a funnel, then slide a knee-high nylon stocking over it, as shown.

Pour or spoon 3⁄4 to 1 cup of the soil mixture into the stocking, then slide a colorful ponytail holder over the end of the stocking to section off the pocket of soil. Repeat this process to make 5 soil-filled segments. Tie a knot in the top of the stocking and trim away any excess nylon.
Submerge the caterpillar in water for 10 minutes, then place it in a plastic bag and let it sit overnight.

Remove the bag and loop a semi-straightened bobby pin through the front of the stocking, then glue a googly eye onto each end of the pin. For antennae, cut a pipe cleaner in half, glue a small pom-pom onto one end of each half, and stick them in place.
Set your caterpillar on a plate by a sunny window and generously water the whole thing every other day. Your critter should sprout hair in about 4 to 5 days.