I am after detailed 2.5d terrain tiles. These would have to involve desert, grass, swamp, rock, snow, forest, dirt... And I also need blended tiles of each terrain. Objects that match each tile would also be helpful (rocks, trees, bushes, fountains, rivers, flowers, etc) but only if they are in perspective. I need a couple of variations of terrain height. And did I mention that they need to be seamless?? The problem is that I can create detailed (read photographic) tiles, but when I place them in my room, they are not seamless. This is really annoying. Any advice would be appreciated. Cheers.

Do you have any screen captures of what's happening? Seeing how they are not seamless and such could help people understand how to solve the problem easier.