Expand on the tileset example to provide a map editor
(The download functionality requires flash player 10)
Free to re-use tilesets can be found on the Reiners website. As per Reiners Readme Page "All the graphics and meshes are freeware. Even for commercial Games. I just want my name in the Credits in the commercial case: Reiner "Tiles" Prokein. You can modify my graphics in every needed way to fit it to your needs: size, colour, fileformat, etc., you can reuse the textures ... . "
Further resources are listed on the widged wiki, under game content and game tiles. (Note however that these links were collected 2-5 years ago, some may be broken)