Minecraft: Creating Light Without A Source Block

I am making a custom map in vanilla Minecraft, and am trying to create light without a source block. The reason for this is that I don't want the clutter of torches, lamps, glowstone etc. Simply put, I want an invisible light. Is this possible?

You can do what Spyfiend did, but I also have a solution to this. It's basically the same thing what he said, but mine is with carpet. So if you want to act like you have invisible light you can use sea lanterns/glowstone, then on top you could put carpet that matches the build in your map.

Assuming you're putting it in a hallway or room, you can put a transparent block on the ground on top of a glowstone block (Or other light source block), an example would be to put pistons or carpet down as the floor, and under that put your light source. You can also make a 2 block deep indent in the wall, put in your light source, then put a sign on the light source and a painting on the sign to cover it.

Another thing you can do that's out of the way is put beacons on the floor, but then the source is obvious.

If you turn off DoFireTick you can put down a grass block, use bone meal on it twice to make tall grass, then light the top of the grass on fire and brake the bottom bit of the tall grass. This last method isn't ideal though because if you put a block under where the fire was it will ignite. You can also hear the sounds from the fire if you're close to it.