I've Had this thought on my mind for ages, for dm's and stuff like that...
how about a spade, which has a marginaly bad attack against players / zombies but could easily destroy 2 x 2 and 1 x 1 bricks, there could be a whole new concept for dm's ( would have to have brick respawn set to off ).. for instance, you could have an open Hole, which would be purposefully brown, and tonnes of 1 x 1's underneath, this would be useful for breaking into enemy's bases!
* motto * if only GPS worked underground....