thought I'd chime in with my two cents since outdoor tiles is something I've been very keen to find, but had no luck with yet because everyone uses flocking or a mat when it comes to outdoors.
Personally, I'd love tiles that are square, 1x1 grid. I play pathfinder, so that format would work well for our game system ease of use. i don't know how repetitive the tiles would get if sculpted 1x1 rather than 2x2 or something of that nature, but the grid is very nice to have. Fallen maple leaves, flattened grass, flat flower patches, flat pine needles, flat dirt, flat root covered ground, and flat pebbles on the ground would be neat!
forestz, that is amazing! Very close to my ideal for outdoor tiles. They look wonderful, and I've always thought that 4x4 would allow for a good amount of sculpt variety while still helping to maintain a grid. (For my personal super-grid pathfinder group, Id have to see more grouped together, but the grid does tend to get a bit lost because of how subtle the transitions are. But because it's subtle, it's way more natural looking. )Again, it's absolutely beautiful.