Allows you to render all of your project's material thumbnails from the default spheres to flat material thumbnails with proper framing.
Pros
Beautiful, flat, readable thumbnails
Cons
Must re-save all materials for the new flat thumbnails to save properly
If that works for you, get this plugin!
Instructions
Once the plugin is enabled, you'll have 2 new menu items in the Content Browser settings (see picture):
Flat Material Thumbnails
Refresh Material Thumbnails
Since the default spheres are already cached inside each asset, you'll have to "Refresh Material Thumbnails", which will re-render them. This process will dirty all of your materials so they'll need to be saved again. That may be a problem if you're sharing a massive project.