Backdrop..sky?
Blue bulbs.
They will extend ambient light a similar color to the backdrop, effectively expanding it
Nicer wall hung televisions actually cast colored lights past the frame to the wall to expand the percieved field of vision.
Instead of globes you may want to fabricate or buy sconces to direct the light and allow the backdrop to be closer to the wall.
If your backdrop reaches the ceiling, holes could produce "stars" for running at nigbt.
My backdrop is and old door skin. Over the knob hole I placed a peice of yellow cons truction paper for a sun. With the overhead light off and a landing light on, the sun becomes a glowing yellow moon.
