3.1.1 Nether Ore textures
Version 3.1.1 includes textures for Nether Ores and Biomes o' Plenty's Overgrown Netherrack, among others.
Outside (V3.1)
Some of the more noteworthy block texture changes
Nether (V3.1)
A sample of the moody Nether
Menu (V3.1)
Some item textures
Nether Ores
v3.1.8 using multiple mods that add ores to the Nether