What platform are you on ?
With PC you place the Generic Shape (building block) then once placed in your map select it and look at Object Preferences, from there you have a drop down box to select the texture.
On Console I did some images below, basically select Generic Shape you want & place into map.
Select it (you can select / highlight multiple Generic Shapes at once to save time)
Then press Square on PS4 Controller, with Xbox One press X for Object Options
Now chose Custom Properties & press D-Pad Left or Right to scroll through the choices.
You can change the water color, alter some fire color, change color of lighting and similar stuff so look out for Object Options on some other choices.

Also Ziplines you can alter the look of the rope from straight to sagging and Grapple Points for climbing you can change how long the rope is.
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