1.) scambledporn.com - If you can remember tv before it went digital, porn used to be scambled by varying the horizontal sync of the tv signal for that channel. This made it unwatchable, unless you were really really patience. My idea is to create a website that has porn that works on the same concept; it would be scrambled until people pay to have it unscrambled. The more you pay the more unscambled it would be.
2.) Fire Energy Convertor (FEC) these are self contained devices that can be dropped into wildfires. Once placed into the fire; the device would convert the heat of the fire into electricity. After the fire subsided, the device would be placed into a grid that would provide electricity. Let's stop wasting all the energy that is release by forest fires. Eventually the device (FEC 2.0) could be placed into active volcano as well.
3.) An exercise device that can be used while you shower. It would be like killing two birds with one stone. People wouldn't have to worry about having to take a shower after working out, because they would already be in the shower and can soap up when done. The marketing plan for this device is a 30 minute infomercial that walks people through its use, with several nice looking and in good shape people. When you purchased the device, you will also receive a instructional video of your choosing (Male, Female).