This are where all the bad ones are. Some of these weren't actually my idea, I just improved them and drew up plans. That's the best part about no patents.
Chess Board- This was the first thing that I ever drew in a 3D drafting program on my computer (Solid Edge). The video took about 26 hours to render. I've since upgraded a little bit.
Marshmallow Blow Gun- This one is one of those that I saw somewhere and improved. There are plans for making your own as well. The plans are copyrighted though. SchematicPlans
Desk Organizer- I designed this as an organizer for the locksmith shop where I work.
Plane- My old roommate and I were going to build this plane to fly autonomously from Salt Lake to Provo. We had everything except the real time to do it...