A couple of interesting mods to Hybrid vehicles: improve the gas mileage of your Toyota Prius using solar panels, or by storing an extra battery in the trunk.
It seems like these designs may still need a bit of work, but perhaps they’ll be more crystallized a few years down the road when I’m ready to trade in my Civic Hybrid. And if not, the convertible Beetle, running on biodiesel, sounds attractive as well. :)
I hope they don’t come with bucket seats.