Even though we already have torches I think it would be pretty cool to have a string of light bulbs like they do in real mines and basically when you place a light bulb one block away from the other it would create a string now don't get me wrong I love torches but I kinda like them in my home for decoration not to support light and yes the bulbs can hang on the ceiling (only)
heres how I think it should be made
glass glass glass
glass glowstone glass
glass glass glass
Now i'm just giving my opinion so please don't rag on me saying "oh we have torches there is no need for this stupid crap"
*rags on*