Here is a map I just built after looking at yagyuninja's awesome map he built. Here is the link to his...
http://heroscapers.com/community/showthread.php?t=5797
I was already looking for a good idea for a muli-leveled map and loved the way his looked. I started thinking about my own after viewing his for a bit and went to work.
This map uses 6 Masters, 3 Castles, 3 Valcano, and 3 Forest sets. I left the starting areas small, but could be reworked. I like bigger starting areas, means bigger battles. Anyway, here are my pics.
For the moment, I call it....Hell's Castle.
This picture shows off the lava a little better.