That's an awesome piece, ArmyGeo!
This is probably a silly question, but did you cut the glass as you went so that you'd have glass of the size you needed, or did you estimate and cut it at the outset and work with the pieces you had?
Were you able to prevent any grout from getting on the glass, or did it just come off easily before it dried?
It looks beautiful even when unlit, but amazing
with the lights on behind it. I wonder, is it able to be hung on a wall? I would imagine the lights get relatively hot, and it looks like they'd be directly against a wall if it was hung. Have you considered using LED lights? I'm not sure what they cost, but I've heard that they produce next to no heat and require very little power, which would make the piece safer and reduce the total cost of ownership.
I haven't seen anything like this piece before, though admittedly I don't know all that much about art. Is this something you read about and decided to try creating, or did you come up with it yourself?
As for how much you could probably get for it, I'd imagine that would vary a lot depending on where and how you attempted to sell it. I wouldn't think $1,000 is outside the realm of possibility, though. I have no idea what the average person interested in something like this would be willing to pay, though, so I voted for somewhere in the middle in your poll.
Oh, and the lamp looks great too, of course! Is your mother partial to elephants?