Super Simple Materials
The addon was created in Blender 5.0 but should work on all newer versions of Blender as well.
All the materials work in both Eevee and Cycles, but I primarily intended them for Cycles. (the glass materials might be a bit funny in Eevee)
Installation
Standrad Blender Addon Installation
To install the addon, open Blender and go to Edit > Preferences > Add-ons. In the top right corner you will see a drop down arrow, click it and select "Install from Disk".
From there select the ZIPPED folder "SuperSimpleMaterials". It should be enabled by default and located in the N panel under the name "SimpleMat".