I've recently downloaded BrickLink's Studio software, which is very similar in concept to Lego's Digital Designer. The advantage is that you can convert models into wishlists on BrickLink so that you can buy the pieces needed to build them (much like LDD was originally designed to do before the Lego Designed By Me program was cancelled). It can also do a nice 3D render of your designs.
Naturally, I decided to have a go at designing some sort of hover car.
Since I like to display my cars infront of my collection of modular buildings, and since I've tailored my collection of modular buildings towards looking like a small American town in the 1950s, I decided to build a retro hover truck. I am thinking of modifying my buildings to give them a sort of 1950s dirty future look. This design is based on a wheeled truck I built to go with the town in it's normal 1950s state.
I've also been mucking around with a flying ice cream truck, but it's not really ready yet. The body needs a fair bit of tweaking to get the shape right and there's no interior at all yet. I do plan to order some of the parts to build these soon - I already have some of what I need.