MAC address is based on the hardware I believe so unless you swap out the WiFi module, you're stuck with that address.
Although, I was able to use an nVidia utility on my old laptop to assign a new MAC address but I'm not sure if this changed the hardware value or it just used the software to THINK it was the address.
"ifconfig eth0 hw ether 00:00:00:AA:AA:AA"
This is how u do it for an ethernet card under linux.. wifi module is a source based build in pershoot if I know correctly. No idea how you can do it for wifi tho...