Did you know that you can "tint" glass with alcohol inks (a scrapbooking ink)? I did not. Until I read this tutorial from One Lucky Day.
I picked up my ink from Hobby Lobby. It was even on clearance - $6 for 3 bottles. And a little goes a long way. I used the Wild Plum and I probably didn't even use a quarter of the bottle. Also, you're supposed to use specially designed felt pads for applying the ink but I didn't want to buy them so I just used cotton balls. It worked great.
Here's my new wild plum lamp: