I finally managed to combine my Ha horsehead from a couple of weeks ago with some newer RGB data. Unfortunately the RGB was captured on a night with drifting high cloud. There were some weird features in the colour data. Quite a lot of flaring in the blue channel led to some blue/purple blotches - not sure if it was from the clouds or internal reflections but I tried to reduce this in post processing.
This is my first ever Ha RGB combine and not entirely sure of what I was doing. I tried a process outlined on Russel Croman's website. At the end he says "season to taste" and I certainly did that.
See larger image
here