I actually do almost the same thing but I set up a small RGB array of a 300mW 532nm, a 1.3W 445nm, and a 1W 638nm. I set them up on a small stand rig I made and them them on unfocused on my ceiling in my room and it has an amazing effect in my room. I position the three laser dots in a triangle at about 6 inch spacing so I can attain shadows of all the combined colors of the beams (cyan magenta yellow...) and fill my room with a near white glow.
One of these days I'm going to take a few pictures of it XD