Our family always played a lot of homemade, made-up games at birthday parties growing up. One of those games, the rice and safety pin game, was such a hit that our family kept playing it for months afterward.
To play, fill a bowl with rice and mix in a good number of small-ish safety pins (making sure that all of them are closed, of course). For each person's turn, ask them to close their eyes or blindfold them while the timer is set for one minute. During that time, they must try to pick out as many safety pins as they can. It is much harder than it looks! Part of the fun comes when it is not your turn and you get to see how many pins slip through the person's fingers undetected.
Here is my husband taking yet another turn- determined that he will improve his score!