Here's one I did recently for Kobold Quarterly - issue #15 out today. You should check it out (pdf here: http://www.koboldquarterly.com/KQSto...roducts_id=100) - especially the cover. Anyway, the map was created for an article about vertical encounters and how to make tem work with a vertical map. I think this one's kind of fun. The encounter requires the players to race a drider to the top of the tower before it breaks down the landing door and kills the king. Great article, and a lot of fun to illustrate:

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This is a low res (25%) preview of the actual piece, and as it's a commission piece it's rights reserved.