Dynasig is a dynamic PHP script which lets you set a mood using the control panel, and adds a picture for it, aswell as a random quote to an image which you can use as a sig on forums. Version 1 is just a preview really, and I'm hoping to add support for winamp, mirc and loads more features in the future. You can make sigs like the one below with version 1.0.

Download Dynasig 1.0
Control Panel Screenshot