Does anyone have any advice on how to "decorate" my boyfriends mancave?

For christmas I am "making" my boyfriend his "mancave" i have some ideas but i would love some fresh decorating ideas..... To help you out a lil hes a big oakland raiders fan, loves video games, and animals ( i already bought him two parakeets, two atiels, a rabbit, a german shepard and a chihuahua) basically thats him in a nutshell..... please no one i dont want to hear that raiders suck or whatever i just want advice on some ideas on decorating please.......Thank you in advance