I made an edit to the alternative stone bricks that I think looks great.
2 can play this game!
These are bunches of 4x4 set of blocks surrounded by normal wood.
The 4x4 on the left is "closed" (you can see 5x5 cubes on the texture, this is done so normal wooden planks look better next to it) and the 4x4 on the left is just as Katadeus made it, just that with different colors, this one merges with the planks.
I am thinking of making a DecoCraft mod, that just adds new block types with no additional use than decoration/building. (Concrete, different brick colors, different wooden tile type, different doors, and so on). Anyone that could script that for ModLoader (So it also works on MP) thinks he can work with me?