Single face FakeTube shader can be used as a flat decal snap to walls, floor or any objects to improve scenes details.

This shader uses PBR textures, hand-drawn with love.

There is currently a Library of 16 examples that will expand a bit.

Check out Guide, Free version or Unity version.

Features:

• No need to change scene geometry.

• Some visual effects like a fog, heat, distortion, parallax, rotation, light emitting.

• Allows to animate any shader properties.

• Work both eevee and cycles.

  
  

  (!) Shader can't get shadows from outside to inside and uses Fake Shadows that can be adjusted. By default they are set about from top to bottom.

FakeTube Addon vs Blender Asset Browser: 

Basically, it's the same thing and you can use whatever you like. However, Addon allow to fast adjust FakeShadow.

Install:

FakeTubeAddon.zip as usual Blender addon.
or

Extract .zip and select path to faketube_bundle.blend for Asset Libraries in Blender Preferences. All assets marked for Asset Browser.

FakeTube Shader settings: