Of course! If you have an emblem idea, usually you can post it in the emblem discussion thread (which some emblems were made due to members suggesting it in that thread) or talk about it to any staff member. Make sure you have a concept if you want to talk to a staff member about it. Though, they're suggestions. If they get made into emblems, you don't have any rights over it. You may be credited for the idea or something like that, but you don't decide who gets the emblem or anything like that.
1. Think of an idea.
2. Develop a concept.
3. Present it in the discussion thread or a staff member.
4. The staff member may (or may not) bring it up for discussion in the staff forum.
5. The higher staff deliberate on whether it should be made into an emblem.
6. It will be added to the emblems.
It usually takes about a month or so for emblems to appear because it takes a while for the entire higher staff to discuss the emblem.
One thing you shouldn't do, don't make a new thread in here for every idea you have for an emblem. Since there's already a discussion thread, like I said, present it there (or to a staff member) and it'll go from there.