Something I'd pay a rediculous amount for, and I'm sure MANY people on here will also buy:
Headlight. Covers.
eBay has a few up at anytime for a sedan, but I've never actually seen what the "Legend Specific" covers actually look like, look like installed, and if they are worth buying.
I, personally, have a coupe, and am constantly frustrated at not being able to find headlight covers for my car.
I'm not talking about a vinyl overlay, either. I want an actual piece of plastic I can fasten over my headlights, and I want it smoked. If you developed a mold for these covers, you really could make any color and shade under the sun.
The reason I'm so desperate for these? Well, after $350 for black-housing JDM lights, $250 for projectors, $35 for angel eyes, $150 in labor chargers, and $325 for two HID kits, I want my headlights protected and protected well. I'm sure many others on here would at least want a clear one to protect their own investments as well. Glass Euro's, anyone?
As I see it, it would be cheap to make, in comparison to your other conquests right now, could be in production quickly, and potentially turn up a huge profit.
