Today in IRC someone asked about how to disable the texture interpolation in Cycles.
But the thing is, texture interpolation settings are currently not exposed in the UI.
I came up with a Node Setup which scales the UV coordinates accordingly,
so that it appears as if there was no interpolation happening.
The usage of this Node Group is realy simple, just add the Group to your existing material and connect it to your UV inputs on the Textures.
Here’s my results: whitout/with my node group
The used image textures were 3x3, 4x4, 5x5, 6x6 pixel big