While the BoP mechanic can be annoying for certain crafts, the diversity is what should be expanded upon. As noted, a recolored speeder. Does it have better stats? Faster speed? Weapon systems?
Furthermore, I would like to be able to purchase or craft other vehicles that allow others to ride with you, like the more recent mounts available in WoW. I would also like the ability to craft weapon emplacements. These would make BoP crafted items a lot more useful.
Keep in mind that SWTOR is in its infancy, even if MMOs and mechanics such as these are not. More will be forthcoming. What we should be doing as a community would be to provide suggestions, starting with feasible ones.
On a related note, I think it would be nice if there were a kind of toolset for creating content to submit to Bioware as options to be implemented into the game, approval pending, of course.