Cardboard robots are great craft for a robot party or any afternoon when boredom strikes. Since the arms and legs are joined together with brads it makes them all that more fun since they can move! Details are at Ambrosia Creative.
Love this idea at Eclectic Mom for covering brown paper bags with duct tape to make totes! Although they were created as Easter baskets I think they would be useful year round. This would be a great party craft for tweens too!