Well I dont think we have any tuts for maps specifically for map tool or even VTTs in general as most of the time they are normal maps without the moveable stuff on them. But we do have a forum for VTTs in the main listing so you should be able to look through that and find some maps you like and check out how they made them.

Also, I would recommend looking in the finished maps section and looking for the sticky thread for the finished map thumbnails and paging through the maps there till you find some you like and looking at the threads. They usually have a link to the WIP thread for the map before it was finished.

My opinion tho is that most of the time you are doing either a small bit of terrain maybe 100' - 200' square so you just layer up loads of textures of real stuff - mud, grass, scrub, bushes, trees etc or else your doing a city section in which case its all the previous plus some house / roof textures. Try creating layers in PS / Gimp etc and spraying down some textures which you can get from a load of places and we have a topic in these forums of resources which list places to get useful stuff. My preference is CGTextures.com tho mainly cos the site is so easy to use.

Id also point you to this challenge:
http://www.cartographersguild.com/sh...op-WITH-PRIZES!!!

with these entries:
http://www.cartographersguild.com/ut...gers_May08.htm

which may also give some inspiration.