I have a DBM 500 point Lydian army (I/50) that I first started in 1994 (I think it was) and finally finished painting in 2010 (result!). The army is made up entirely of Chariot 15mm figures sold now by Magister Militum (see below). However, in parallel with painting the figures I have been slowly building up arid terrain and particularly buildings.
The general idea with these has been to make them a slightly large 15mm and have them suitably desert-like so that they could be used for any likely period including Ancient Near East, Africa (AK47) or Mexico (for my long term plan to wargame the Maximilian Adventure in Mexico). Anyway, here's an account of something I've made over the last few evenings.