I wanted to do that too, so I just got lazy and cheap and took some strait Rit* dye (Royal Blue) and wiped it on and then wiped it off when it had some time to soak in....it worked out real good, I can't see anymore "leather" color (brown) on my nice blue seats. Once your done with the dye just give it a good rub down and put some Armor-All on it and to be safe, try to wear dark blue colored cloths for the first few times you drive it... oh yeah do all of the seats, the Royal Blue is just ever so slightly Darker (or lighter I cant remember) than the Blue BMW used.