Edited on April 26, 2003 by Christophe: The attachment has been removed to save space. The new alternate tiles are now part of the CSBuild distributions.
I was finding CSBuild difficult to use as I found the icons a little indistinct. So I built a new set of icons which I feel distinguish objects more clearly. They are based on the icons I've used for the maps on The Dungeon Master Codex (http://www.dmcodex.com), and luckily Paul Stevens had used the same size icons (16x16) so I had very little modifications to make.