Leaf tectures are mostly showing a Voronoi-like pattern. Sadly, the svg spec doesn't provide a Voronoi noise filter primitive as a base, so every organic looking texture can only be recreated with large limitation. This time, gave it another go.
A closeup of the leaf is available here -with proper rendering presented here.
Also, this is the starting point of the soil and vegetation collection.
Edit: exported another variant with inkscape 0.92, so this one should look better than the previous thumbnail from openclipart.
Check this link for a fullHD wallpaper.