Originally, way back in 1.0.0 I had a mod for lighted obsidian so if creepers showed up and exploded it didn't undo what I was working on since they can't destroy obsidian. Sadly, that mod was never updated and died in the rest in pieces area of no longer used mods. Another mod I had found was one for lava obsidian which generates some light and prevents creeper destruction. It was usable in 1.6.4 but no later, however, I discovered it had a problem. If you managed to get enough resources to get 1 and placed it, then did something... stupid, like... oh, I don't know placed a pipe on top of it, the block vanished as if it never existed and you put the pipe in it's place. So pointless to even use it.
Mainly tho, no, I'm not looking to stop spawns, I want a permanent lighted source that can't be destroyed by creepers, or anything else for that matter. Also to give it that.... you know... artistic approach. Something that looks nice as well and aesthetically pleasing to the eye. Lave obsidian looked downright cool, but that was quickly negated when the whole block disappears cause you can't build on it.
Like I said, not sure if it's possible, but it's an idea.
What mod would that be? I would like to 'see' what mod it is... So... you want a block that can give off light, and not blow up? Without taking any mj or eu power?