Over the year I have been a part of too many WOW forums groups to count. Member of some, admin to many. Here are signatures I have used over the years. In a way, these tell about my history in WOW.
Looking through all of these, you can tell there is a major difference between using paint, etc. and doing one/having one made in photoshop. It also looks like photoshop has improved over the years, but I wouldn’t know.
Our guild used a facebook group instead of a guild website forums starting with Cataclysm. I also had the banner to this blog site made by the same person that did most of these signatures.