I just made a 400x300 psd and created with a dark blue/black/grey background with a radial gradient (Looks like a faint spot light in the center) and just made a simple gloss looking floor/dock/whatever you would like to call it. Why do you ask? Thanks :3
Hmm. I tried it out and couldn't get the radial gradient to fill the entire space (I was working with a workspace of 2560x1600px) But I came up with this: [link] For some reason I can't get that shine that you have on your "dock".