Posted by Billiam Babble on Nov 13, 2010; 9:10pm URL: http://the-lost-and-the-damned.71.s1.nabble.com/Tile-based-Marsh-Swamp-area-tp5735696p5736221.html
I think the trick with swamps or marshes is to define the difference between the totally saturated areas with the passable "path" areas.
There's very some cheap sets ($1.50) by this guy, although the marsh set I was looking out looked like it had wooden walkways, which didn't quite look right.
http://rpg.drivethrustuff.com/index.php?cPath=5652