I like AmAnRN. I think that's pretty clever.
If I ever graduate (next May) I think I'll change to RebelRN, because my nickname is 'Reb', and it fits my personality. (Never thought much of the status quo)
Do you have a personal nick that maybe your family/friends/SO calls you? You could make something out of that... or how about thankgodschoolisover? Too long maybe.
I know... SurvivorRN. You survived nursing school. Maybe you like Survivor on TV, although I'm over the bug eating stuff. Maybe you like Destiny's Child. It could have several meanings.
I think it just has to mean something to you.
Sheesh, I shouldn't have taken that diet pill. I can't shut the freak up now.