Ideas:
make sinew
thread to use in future projects?
make a thimble for pushing leather needles?
make braces? from wrist to elbow, to extend leather gloves for working with thorns
make a boiled leather item? a bowl?
make a waterproof canteen? packed with sand and boiled till hard?
add leather soles to a worn pair of moccasins? thick
enough that thorns won't go thru
make a stitching horse?
make a safe way to carry a hatchet or machete on your belt?
make leather winter
boots? waterproof and insulated with natural materials. at least ankle high.
make sandals suitable for working in the heat? closed toe, not flip flops, thick flexible sole.