Well, after (finally) putting the time and the energy and cash / credit behind getting them all reholdered I had thought that a picture of the group of coins all in their matching slabs would make a good banner image for my 10G set in the new registry.
While I do think the group of coins look good and I'm still happy I got them reholdered, and while I do think the images looked good, I have to admit that they fell a bit flat as banner images.
I think they look great in person though and I think one day they'll look very charming in a display case together - maybe with 2 (or 3) more coins to complete the set, if I can ever get those.
But for the banner image I've adopted something akin to Coinbuf's approach:
I think Mike's approach works well for Silver - especially given the color scheme of the registry - but it seems a bit over-the-top and gaudy for gold - with the below as just a quick and dirty example
I took new images of every coin in the new holders and I was aiming for showing off luster but I think expanding gold color out would work better with more flat lighting..
Of course, I did re-image the whole set in the new pronged holders... So now I just need to decide if I'm going to post the cropped photos straight or go with the blacked out versions...
I've always tended to favor the images showing the prongs / holder because the goal of registry images is documentation of the set and the image with the prongs is a more accurate representation of the coin as it is in person but the blacked-out image has a certain cleanness to it and I can understand why it appeals to many.