These little eggheads are an adorable project! Just plant the grass seeds and watch the hair grow. You can even use these eggheads as seed-starter pots because they are biodegradable and full of calcium for your plants!
For young kids who might have trouble handling an empty eggshell without breaking it, start with drawing a face on the egg with a permanent marker (washable markers will run when you water your egghead).
This step is a little tricky, and may require some adult help. Tap the pointed end of the egg against a hard surface until it is slightly cracked. Using your finger, pull off bits of the shell until the opening is big enough for a good crop of hair.
Dump the raw egg out (may as well make scrambled eggs while you're at it!) and rinse the empty eggshell.
Place your eggshells into an empty egg carton, and then place one soil pellet in each. Add in water until the soil has expanded and is nice and moist, or just use potting soil. Sprinkle the grass seeds on top.