One thing I’ve always wanted is the ability to create a “personal” tabard outside of your guild options. If you change your guild tabard options you wind up changing all guildies, so it would be nice to simply have a “personal” tabard that you could simply re-design yourself.
It could just use the default guild tabard setup/colors/options, but it would be a tabard you can create for yourself. Would be awesome if you could save them out as well so you’d have multiple custom tabards to use for different transmogs.
Sure the current guild tabard colors/icons are pretty old by now and could use an upgrade, but simply allowing players to “make their own” would be a huge boon to transmogs.