Unfortunately, the forum is a shell of its former self in terms of activity. So most of the sigmakers I'd tell you to view have been "retired" for a while, or only rarely make signatures.
Anyway: Gannon, Alliance, Amity75, Peach, Aurora, TOH, Phucked Up, H.S.6, Pittman, etc. Or mine, I suppose, but I consider the majority of my work subordinate to most of those I listed. Some of their galleries are still of page 1, others you may have to type into the search or dig a few more pages. It can be good just to get ideas to try for yourself, because attempting to copy exact techniques or signatures generally ends poorly. But I'm started with a signature in mind plenty of times and just improvised once it went in a different direction...but having a template to work from helped.