Everyone's favorite cheap-but-quality instrument shop, Rondo Music, has a guitar with the exact body shape I'd love to see on a bass:
I love everything about it. Classic-looking, but still a little edgy--what William Gibson called "raygun gothic." Even better, when I e-mailed them about it, Rondo says they're considering making a bass version. I suggested two single-coil pickups and the same switching scheme as the guitar version. Whammy bar optional.