Slight crop -> Rotate -> Flip I think? -> Pulled in a bit on left & right in levels -> Curves a gentle Z -> healed some blemishes -> Resize -> NI -> Save for web.
Below is a shot I took of these pillars a while back with my P&S. My new Rebel can handle it much better and I was able to get the smooth gradations I was after much more easily.
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This looks like an inflated air mattress with the extra sharp line at the edge of the first and second curves... but the shapes/color could represent lots of different things on different scales. Leaves a lot to the imagination. Nice!