My next game could well be a 2D tile based game. This is mainly, because I want to use my 2D grid based crowd simulation code. So here I will collect some inspiring art work I found with Google. Note: none of the images are mine, they are all copyrighted by their respective authors. I'm just scrap-booking here to see what art work is out there.
An interesting variant of tiles on a 2D grid, is the use of a height-map, so that there are still NxM tiles on a grid, but each tile has a height. The advantage of doing this over free 3D, is that the navigation on a heightmap is still a 2D affair.