Some nice shots there Pascherik.
@roland & pixel, how many layers would be enough ?
One technique I've used before is to use several of the same texture at different tilesize, this way it looks good upclose and from far above. Still five textures, but applied several times at different resolutions, like 3 for sand, example, one streched (1 tile), one at 16 tiles and one at 256 tiles.