Yes it's possible.
i want to spoof my MAC address with one of friend's, v r in same n/w, is it possible in BT2 final. i m using WI-FI
u can use macchanger to change your mac to what ever you want.
> macchanger -m 00:11:22:33:44:55 ath0
this changes ath0's mac address to 00:11:22:33:44:55
at least i think thats the syntax, i might be a little off, look it up