Here's mine from a while back:
Here is link to the same gui with what it might look like with multiple windows (I know, it's not good on a portable...) open at once with music playing:
LINK
ONE WITH A FOLDER OPEN
Here's a different GUI that I came up with:
LINK
SAME BUT WITH FIREFOX OPEN
Enjoy!
Interesting designs, might work. but it won't be easy to convert firefox into that. Mabye just take the mozilla rendering engine for a little built in browser. As long as it has tabs and a full screen button. Because browsing anything but google on a window that small on a screen that small won't be fun.
Personally though I think something cross between the EEEPC's interface and GMenu2x would be a better place to start. Myself I'd want the FULL features of every program. Including file browser. A complete custom remake of everything (file manager, browser etc) though good in theory is a LOT of work and may end up with a lot of limitations and few features if it's not done properly. Depends on the type of user really. Maybe a lite and extended interface may be needed. For people who just game, vs people who use desktop apps too.