The only thing I use 8 oz glasses for is whiskey, not sure why I would want more fragile rocks glasses. (Thinking 12 oz bottles) perhaps cut bombers would be more useful, but I still don't see the point.
I've seen people do something similar with wine bottles to make lighting fixtures / chandeliers. Could be a really neat piece in a man cave or barroom.
There's a couple of people who make soy candles out of those cut bottles. I've turned in a couple of my bottles for it and now I enjoy drinking a huna, out of a huna glass, to go with my huna brownie, by huna candle light... Huna inception Joke aside they do make interesting candles
One day I'm going to get one of these kits and save some bombers and liquor bottles with cool designs. I'm not sure if I'd use them as cups or make something crafty out of them like a candle, we'll see.