If and when we get this implemented it would be great if we could apply a tint or filter maybe even a semi-transparent texture alternatively, this would allow all types of glass-like blocks. Minecraft only had one type i think and it did look repitious when you used it on a lot of things, mods of course introduced more. But having a few different ones by default that we could alter colour and transparency would be cool. These also could be used for neon signs and lights too if we fix a light on them.