Cool cross country jump! I think this could be easily done by drilling big holes in a fallen log or even 4x4, then bundling cut grasses (I'd wrap the bases with floral wire) and inserting into the holes.
Epic Horse Jumps
building horse jump standards | Portable Competition Jumps | Ordering | ETB Equine Construction
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horse cross country course - Google Search
cross country jumps (summer Project)
Pallet jump, fill with brush - fake xmas tree branches?
Horse Jump Ideas
beginner style jump... Very inviting
cross country jumps - Google Search
cross country jumps to make for horses | cross country horse Car Tuning