The first one was a matching game with fresh fruit and dried fruit. I used muffin tins and put the fresh fruit on one side and the dried fruit on the other side. I explained to the boys that when you take the water out of the fresh fruit you dry it and it ends up like the dried fruit. So then I had them match up the dried fruit to what it used to be. They did really well. I only had to help them once (with the raisens). We had grapes/raisens, bananas, strawberries, apples, and pineapples. After the game they enjoyed the food for a snack.
Our second project was butterfly feeders (thanks Unplugged Mom for this inspiration). I let the boys get busy cutting strawberries (butterflies are supposed to be attracted to red) and they were really excited about using knives. I never let them use knives and I think my sweet husband was utterly appauled when he found out. We also put out some old plums and oranges. From what I read several internet sites the more rotted and nasty the fruit the better, so that's what we went with: nasty old plums, strawberries and oranges.