deagles-rabbit, shoots two buckteeth...or throws carrots.
mp5-birds nest, shoots baby birds at you...or eggs.
ak-monkey, throws bananas.
steyr-cow, shoots milk.
spas-porcupine here would be cool.
ruger-snake, sheds its skin at you...or spits venom?
barret - giraffe, can shoot whatever i suppose, but anteater works as well...can shoot ants i guess?
minimi-rhino, shoots horns?
socom-cat, shoots hairballs
law-ostrich egg launcher while we're using eggs as eggsplosions...
knife-i like swordfish idea, someone did a trout (irc)
saw-electric eel, lights up, kind of like a taser?
ehm hard to think of stuff =/