For this workshop, we applied our skills in hammering, sawing, and drilling.  We made critters. The rules were simple: use two eyeballs, make something move, and hammer, saw, and drill.  We had quite the variety of critters - from 4-wheel rolling critters to flying critters with propellors.  This workshop was open-ended and allowed for more creativity than our "by-the-book" workshop on making boxes.