Making a bike personal doesnt normally include just mass market items. You could very easily fit a plethora of tanks on the bike. Or take it to a shop to get a custom one made.
The whole make it yours it based on the fact the made the bike very easy for custom work to be done to it.
Way to kill the mood here, dude... lol
Sure, nothings impossible, but as modding goes, in general, the gas tank usually stays the same for most.