some would be cool, but a lot simply would not work.
how would they make a dragon eeveelution? dragon= not a fox in any way whatsoever.
ghost is my personal favorite. Phanteon. (phantom+eon) Black colored with purplish fog around the edges.
bug *might* work...
poison would be called Toxeon, but i don't know how it would look... i keep imagining nidorino.
Ground would be sandy...don't know what to call it.
Rock would be Bouldeon, and be kind of like a regirock plastered on the basic eeveelution form.
steel... Ireon? Ironeon? (Iron+eon) maybe Metaleon...i imagine it as sort of a robot.