This tutorial uses a
specific set of base clone files which you can download here. These are versions of a basegame file (the Musee Public vases) that have been altered to speed up the process of making deco objects and (hopefully) eliminate mistakes in getting a file into the game. Anyone can make their own set of customized base clones once they know what they want - I just decided to share mine.
This is
not a tutorial for an absolute beginner. You should know how to make a mesh already, and it is probably a good idea to have at least tried the repository method prior to this. This is NOT a new method, it's just a shortcut version of the regular repository technique that is facilitated by using the base clone meshes.
If you want to actually make the Warhol painting meshes, you can get the .obj files and textures
here. There are .obj files for three meshes - the two shown in the tutorial and an additional slave mesh that lies flat on the floor. The textures are in png format. I made these meshes originally (along with a Warhol Brillo box!) for Jenfold's time machine contest, but I had the usual game trouble and so didn't get to enter after all.
Mod note: The specific set of base clone files nixy mentions are unavailable