Another avenue I looked at to accomplish this was Flow Designer, but I couldn't get it to work like I needed. The idea was to trigger it off of a created catalog item that doesn't have a picture set, then update the picture field on the catalog item with a picture stored in db_image. I could not get this to work after messing with it for a while, but wanted to post this in case it gives somebody an idea. 

Another option would be to use a catalog item template, but I don't care for those.