I don't think he was asking someone to give him an account, only for a 3 letter suggestion. All possible three letter combinations. **EDIT** So I can't put all of the combinations in here because there are so many, so go to this pastebin. http://pastebin.com/0SC7vSa2
A friend of mine wanted one and we both tried for about an hour, and didn't find one spare three letter/number tag. Best advice is go with something original and that means something to you.