I have been playing around with my Veil Nebula mosaic data some more and I thought the contrast between the Ha and Oiii was interesting...
It looks best at higher resolution, of course:
http://www.astrobin.com/165087/
The full bi-colour image is here:
http://www.astrobin.com/143114/
Update: here's the animated gif version:
http://www.astrobin.com/165204/
Cheers,
Rick.