i'd stay away from names that are against the TOS or anything sexual/harassing you will be reported enough for Multiboxing.. no need to fan the fire.

just go funny names or combined names... funniest set of names i've seen are the

Nevergonn Giveyouup Letyoudown Runaround Desertyou. I think this guy is in our forums... and i've always chuckled when i read those.
Think of your favorite tv show.... i.e mines Seinfeld so i named my accordingly. Its always fun to meet another fan of the show.