These will have to serve as a How-To until later:

The following is Solfuge's Palette that he is using for colours.  Just under 1/2 of the 256 possible colours are still available and you're not limited to those shown, but they help as a starting point.


The following image is a Stonesense geometry lesson in image form, uploaded by Solifuge on the forums.


Lastly, here is a dotted outline of the "unit cube" used by Stonesense.  Sprites must be contained within this unit cube, or else they burst through the floors above (or leak into floors below)