styrofoam, nails, screws, and tools! great for OT, or just keeping your boy busy! could also use golf tees and a kid's hammer.
Occupational Therapy Birthday Cake! Have kids hammer golf tees into styrofoam, then have then use a pincer grasp to balance marbles on top of tees. Once all marbles are in place, "blow out the candles!" Great for eye-hand coordination, proprioception, pincer grasp, and deep breathing.