Twister sent us two sound themes for ICQ. These will replace the standard sounds you hear when there's an incoming message, a file transfer request, etc. with bits of Wing Commander sounds. There is a WC Secret Ops one, and another one consisting mainly of samples from the Privateer 2 radio ad. Both are approximately 1MB in size. Installation instructions:
Download the file(s) to your ICQ/Sounds directory
Click the big ICQ button
Choose Preferences and Security
Go to 'Events' and click the 'Configure' button
Click 'Import' and select the theme of your choice.