baran lettuce cabbage

replacing barans in bentos..

I hope I've put this under the right topic..

I'd like to know which vegetables are most suitable for bento food dividers (or baran's), cups or simply for decoration. I've seen many people use lettuces but I don't know which types. I fail miserably at indentifying fishes - if you were to ask me my answer would be "salmon" and white fish, so do I in lettuces.

Can someone tell me the names of the vegetables that I could use?