painting like Michelangelo. Instead of just having sketching time- discover and study Michelangelo, how he hanged upside down while painting. This is also great for students struggling with fine motor hand writing. It builds strength in pincer grasp.
Little boys will love the idea of working like daddy in the garage and everyone will appreciate the fine motor workout you can get from matching nuts and bolts. This idea (and several more in the same post) from Counting Coconuts.