The aliens have invaded! Get creative, have fun, and make a silly alien. Use polystyrene balls as a base and cover them with air-drying clay; we used Panduro Pearl Dough. Then add feet, antenna and arms, which are also made of Pearl Dough. Press on the eyes before the dough dries, to make sure they stick (otherwise you can glue them on). The clay is air-drying, so simply set aside your character for a while and it will harden.