When you say you're looking for something "a little different', I think you need to be more specific. How different?

Most of us an environment sphere with equirectangular images, as noted. Over at Daz, Flipmode has made a Skybox that is itself rectangular, but functions like a sphere.

Or are you talking about the terrain -- the thing people actually stand on?

Edit: Or are you talking about using actual PROPS to simulate a horizon, such as hills and mountains?

If it's the last one, there are some potential pitfalls, as the scaling will be off. For example, I once made a very lovely scene with gorgeous, realistic looking mountains on the horizon. It looked great. Until I put some buildings in and rendered, and realized that my buildings were casting shadows on my mountains. LOLOL.

Hence the environment sphere, because you avoid such issues.

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PoserPro 2014, PS CS5.5 Ext, Nikon D300. Win 8, i7-4770 @ 3.4 GHz, AMD Radeon 8570, 12 GB RAM.