Contents
Waves
Waves could symbolize infinity, freedom, voice, ... They are everywhere around us, and they have ideally smooth shapes.
Round 3
Sulphuric Waves
Burning Blue Sulphur
try 1
try 2
try 3
try 4
try 5
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Alternative Wallpapers
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I would go with a much darker shade of blue:
And here's another lightier one:
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A more gaseous approach.
Round 2
surface of the water
generated using the gimp fractal plugin. here is the gimp fractal data file that created it: water-surface.fractal
animated this could look cool: 
sulfuric waves
Nicu came up with this idea on fedora-art-list so here is my attempt to render it. 
there is a crazy idea about a detail view:
wallpaper
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Round 1
Waves on water
Throw some stones into the watter and see how the nice structure evolves. Can we do similar structure for backround? Here's the first (quick) sketch
Comments
From Mairin
I really like this! It's very calm-looking. It reminds me of Japanese zen gardens. For example:
"Zen Garden" by Timothy (timtak); licensed under a Creative Commons Attribution-Noncommercial 2.0 License.
I really, really love the idea of bringing more natural things to Fedora's artwork, and I really think the sketch above is a great start!
From TrondDanielsen: I think it would be cool if the pattern would change during the day to make the waves propagate outward just like the current theme changes colors during the day.
"Still" pictures of different waves, all at one time
It's like if you wave some fibred piece of cloth and see how the wave structure creates. Here's the first (quick) sketch
Distroting reflections
Waves do distort reflected images, gimp has nice feature to do that - Waves... Here's the first (quick) sketch showing this feature in work on simple background with hand written random text on it (two colours).
