I made a couple of natural looking (well, 'zoo natural' anyway) enrichment items - the mud bath & the forage pool. Should look good in any zoo! The actual enrichment item is incorporated so your animals will use them.
Mud Bath
https://steamcommunity.com/sharedfiles/filedetails/?id=2944092844
Forage Pool
https://steamcommunity.com/sharedfiles/filedetails/?id=2944093188
Mud Bath
https://steamcommunity.com/sharedfiles/filedetails/?id=2944092844
Forage Pool
https://steamcommunity.com/sharedfiles/filedetails/?id=2944093188