Give your Clanmates the most weird of nicknames (examples:)
Firestar: MY BUTT'S ON FIRE!
Sandstorm: IT BURNS SO BAD, GET THE SOUND OUT OF ME EYES!
Spiderleg: LOOK AT THOSE LEGS!
Daisy: Can I sniff you?
Smudge: Ink spilt all over my white shirt
[Leave more names in the comments!]