Some scatter terrain I recently finished up for my desert table.
3mm MDF base with blue/pink styro and some cork scatter. There's a couple of real rocks mixed in as well - just enough to give it a bit of heft and stop them being knocked around so easily in play.
Took around 3-4 hours of work in total I guess, ignoring drying times etc.
More pics here at Imgur !
Other bits and bobs nearly finished, will post soon.