Incredibly beautifully rendered pics by Lee Hutchinson: (spoiling links)

Agamemnon	Zeta Squadron	Narn Cruiser
White Star	White Star	Babylon 5

Some rendered images collected from Internet, most of them converted from 800x600 to 1024x768.
Shadow ship and White Star #1 from Babylon 5 Design Competition (spoilers), both made by Michael Pelletier.
White Star #2 and Hyperion-class cruiser from Wombat Control (spoilers).
B5 #1 and #2 by Lee Hutchinson (spoiling links).

Shadow Ship firing	White Star	White Star
Hyperion + Star Furies	The Dark Side of B5	Babylon 5

Some CGI images, from Welcome to Babylon 5 Animations (spoilers).

White Star during a jump	Hyperion	White Star speeding out
Agrippa and Agamemnon	B5 on Epsilon 3

Some new CGI images, from Desktop Starships (spoilers). At least some of them are by Brent Schmidt (Desktop Starship does not credit people).

Agamemnon closeup	B5 and Whitestars	Whitestars jumping
B5 and ships	The Long March	Agrippa

More stunning pics (from the series, not CGI) can be found at Sami-Pekka Haavisto's pages below:

• Episodes
• Ships
• Babylon 5 & 4
• Miscellaneous

Nifty little utils (freeware):
Transparent Icons 4.2 (download, 55k)

Please also note that Transparent doesn't work well with Active Desktop (used in Win95 + MSIE4.0 and Win98 by default). Please note that it can still be disabled if you wish, just uncheck Display Properties - Web - View my Active Desktop as a Web Page. Also, to be able to do that, the wallpaper you're using can't be in JPG format - try BMP instead.