I'm working on my own set of custom tiles at the moment and thought you might like to see my work so far. I've gone for a comic book look and I've taken a lot of inspiration from the look of older dungeon crawlers such as Heroquest
Kevin Chenevert is raising funds for Blue Dungeon Tiles – Wet & Dry-Erase, Double-Sided Map Tiles on Kickstarter! Blue Dungeon Tiles are double-sided, grid, map tiles in old school blue. They work with dry-erase, wet-erase and permanent markers.