2x1 ramp set: Two blocks (One angle going from 0 height to 1/2 block height; second going from 1/2 block height to full block height) with the most-basic hull type stats (basic hull HP and armor rating), multiplied by 8 colors = 16 new block IDs. Worth it? I think so. You'd be surprised how nice this would make many builds.
Next step: 3x1 ramp set: three blocks with 8 colors: 24 new block IDs. I'm not so sure about this set, but if we get 2x1, people are going to scream for a 3x1 ramp. And probably any number of additional blocks for various corners. Then I think there will be less demand for a 4x1 ramp set.
A pair of blocks for 2x1 blocks would be great, but people are going to demand variations for all hull types, glass, crystal armor, grill, mesh, crystal, etc.
I'm not going to pretend like it wouldn't give SO MUCH to build with. Just look at SE, which has a 2x1 ramp set. But we're limited by block IDs, and getting closer and closer to running out. According to
this site, we're at 651 currently, not counting a few unused IDs in between 0 and that. That DOES give us quite a lot of blocks before we reach the 1024 max, but we should still be careful about it.