Collect about 10 boxes before for the party, about shoe box size. Cut a hole in the top big enough to put your hand in and cover the boxes. Label or number them so you know which is which. Then place a different object in each box. Blindfold all players, get them to put their hand in the box one by one and guess what they are feeling. You could try, for example, cotton wool, toy soldiers, playdough, a toy spider, marbles, toothbrush, dinky cars, sugar lumps, or for the more adventurous, perhaps something a bit more yucky like cold cooked spaghetti or jam.