These links are for simple substrates used for screens as is or as a foundation for a painted screen.
Simple Substrate Screens
This thread is still under construction. There are many different substrates out there and this will be the thread where they are presented.
The Laminate Screen Thread
This is probably the biggest and most well known substrate on this site. Lots of information as well as screen examples are in here.
Laminate Showcase
As the thread title says, this is a showcase for those owning laminate screens.
Painted screen vs laminate screen
This thread discusses the differences between a painted and laminate DIY screen.
The Official Do-able Thread
A regional substrate available to those west of the Rockies. For those that can get it, Do-Able is one of the best and least expensive substrates used as is for a DIY screen.
The Melamine Screen
Another excellent thread by Prof outlining the construction of his new HT room using a melamine substrate as the screen.
Designer White vs Fashion Grey Laminate
This thread is a comparison of the two most often used Wilsonart laminates, highlighting the pros/cons of each. This thread also demonstrates the importance of re-calibrating your pj for each screen, with an excellent explanation of why that's so.