I've discovered the SuperCOSMOS sky survey. For southern hemisphere objects, this provides a higher resolution than DSS-2, plus blue and hydrogen-alpha plates. As a result, I can create much better nebula images and I'm in the process of redoing many of the images on this site to take advantage of this new data. There are several hundred images to do, so this will take a while.
My goal is to create a full set of descriptions and colour images for all the nebulae in the Sharpless and RCW catalogs. So far as I know, this is the first time this has been done and I hope that it will be a useful reference.