I started this some time ago, but I didn't really finish it and I won't finish it now as I have to write my seminar papers first.
It's basicly a halloween themed tileset, hardly more than remixing ressources from the original Forest and Dark Forest tilesets; thus you need to have installed these both.
I tested it only in GAE, but it should work for Megaglest aswell. Vanilla Glest won't work because the textures are in PNG format.
You can download it
here.