Well, while I still recommend letting it patina naturally for as long as you can, there's a method I learned from my pal over in another forum, CharlestonMom. It's ingenious!

You take the bag to the salon and pop it in the tanning bed. That's right. The tanning bed. I took it the level beyond that and put a little tanning lotion on it. It has given my bags a golden brown hue that's just gorgeous. Some people looked at my funny but I didn't care. I'm like, "How else am I going to get my fake Vuitton dark enough to carry??" LOL