Recently I picked up a simple metal lantern, and after looking over it I figured I would make it better.
So the current plan is to paint it all satin black, replace the glass panels with diffuse plexiglass and embed a few RGB LEDS into this as the light source. I'll have the LEDs smoothly transition between each color, and with the diffusion panels it should light up outside fairly well.
Also thinking of doing something like a spot light style lantern, where all the panels are blackened out expect with one to have a lens on it and focus the light inside.
I'll be posting pictures as I put this thing together.