I'd invent a system that immediately transports you from one place to another..sort of like the transporter system used in the orginal Star Trek series.. "Beam Izzy such and such"
I would invent a type of nanite which resides in a special paper which could then be affixed to your wall. The nanites when programmed to do so will display a picture. Then via a USB port you can hook up your computer to your wall and upload photos.
Are you looking for a co-sponsor for that bill (speaking as a one-time retail slave)? 😀
I would invent a drug which would nuke all known sexually-transmitted infections, as well as any which might come down the pike, function as a male and female contraceptive and as a mild aphrodisiac.
A wonder-drug that would regenerate aging or damaged bodily tissues cheaply and without side effects, and a version of Adblock Plus for radio and television that would convert annoying commercials into small text ads shown on a display screen.