
iPhone theme for the Sony Ericsson w810i
Google Talk is light and useful, but quite ugly too. Here you have some themes to make it prettier:
Author’s install instructions:
Put the theme folder in “Documents and Settings\[Username]\Local Settings\Application Data\Google\Google Talk\themes\user\chat\“. The application data folder may be hidden so type it in or view hidden files and you may have to create the \chat\ folder yourself.

Tired of regular themes? Then try the Commodore 64 Theme for WordPress. It may not be comfortable, but is really cool and original.