So whenever a texture is imported such as with little tiles it becomes grayed out and doesn't match the normal block. Not all mods do this though, carpenter's blocks seems to work pretty well in this regard. This is with vanilla textures as well as any texture pack. I imagine it would be possible to fix this with a mod somehow. This is in 1.7.10, I don't know if it's different in other versions.
That appears to be either a lighing bug or texture error with the mod you are using. I would suggest talking with the author of that mod first, because nobody else will have acces tot hat mod's source code.
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