It's completely solid glass and I don't wanna drill holes in it or anything. I just like it the way it is. At night, I'm gonna turn the lights out, shine a red LED through it, and take a picture to use as my avatar.
Wow it's brilliant, i have something similar but it's made of resin and it's skull opens to reveal a small container (i keep coins and de-activated bullets in there)
I posted about it on the Skulltag forums and a guy edited the photo to make it blue. They're all joking around with both skulls saying like "Red skull taken!" and "Blue skull taken!".