Last year, in autumn, I photographed 2 high resolution images of the leaves on the ground.
I got the inspiration to use the photos as textures in Unity3d,
I created a terrain with those photos.
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nice pic! but make the pic smaller as the leaves are not that big in real life
The textures are photos from the real life, i photographed them near my school last year
I think taichiu727magnus is trying to say, you want to match up your terrain scale and your leaf photograph, so that leaves end up taking about 5~8cm of the ground. If the terrain is 1000m and the photograph is 1000px across, then each pixel in the photograph represents 1 meter unless you make the photograph texture repeat at a different scale.
Do you know how to edit a photo like this to make it repeat seamlessly? It looks like it would work well.
You should make them tiled,
Good tutorial:
And then submit them as textures to the asset store 
Ture, but you can change the textures scale in Unity terrain script, (when you select the tex, you can change the scale from 15 to 10 or 20)
