Surprise balls can keep children entertained forever. For a supereasy DIY option, wrap either one object in multiple layers of paper streamers (or wrap many objects in fewer layers). You can have the kids race to open theirs fastest (or slowest!) or simply give them out as distractions as you get the cake ready to cut. Or, just buy a few, hand them out, and have the kids guess what could be inside. Game and party favour in one!