A user called ZachHudock over at portableapps.com posted some much nicer looking icons for 7-zip to replace the really horrible looking ones!
Here's a preview:
I've managed to use Resource Hacker to replace them into the 7z.dll file which you can download here. Just replace the 7z.dll file in the 7-zip folder in Program Files with my edited one and hey presto, much nicer icons!
If you prefer a Vista/7 look to the icon design, ricktendo64 over at Wincert.net, has created a custom 7z.dll file that you can find here.
Credit to ZachHudock for designing the XP style icons and credit to ricktendo64 for creating the Vista/7 style 7z.dll. I've tested my 7z.dll files on XP, Vista and 7 with 7-zip version 4.65 and 9.06 Beta.
Let's hope the authors of 7-zip improve the UI for the next version!
Edited by Zoom7000, 11 March 2011 - 10:11.