After setting myself high standards with the rusty paint shader, I was kinda stressed to produce a perfect background ice wall for the same Industrial TV project. After looking around how an ice wall actually looks (surprise surprise, it is not a huge ice cube), the result is a facing ratio dependent color subsurface scattering base with more reflection and bump layers. Well, looks great, but for the final render I might add some more color layers in the ice. Anyway, this is also only procedural, so no painting needed here (my texture painting skills will be tested in the next project for sure... but you'll see that later).