procedural tilable textures

Description:

I created a node setup to make procedural textures tilable in blender. Included are 4 sample textures - 2 grunge maps, a rusty metal and a marble texture - created with this setup (baked out in blender). Some nodes and the base material are from an earlier pack from here (https://www.blendswap.com/blends/view/89661)

Note that the baked result won't be 100% seamless in the corners, but this can be easily fixed. I tried different methods making them tilable, the actual settings for the texture can be changed in the "TEX" nodegroup (I needed put this in an own group and duplicate it). Other methods I tried gave me bad results like distorted texture-bakes or "mirror"-effects at the seam.