You can create images, animations, java-applets and html pages to share your artistic skills with the world (HTML+APPLET).
I don't create a .pet package because is not needed, you just download, extract, give permission to run to the main file and enjoy...
The JRE is needed (see the quickpet).
To get it, go to http://www.processing.org/download to and Download the Linux version (somebody tell my once that the Windows version runs great on Wine, just a rumor).
Are you a newbie on Processing??? See this post that I made with useful newbie tips and information, and if you have questions about it ask HERE.
You don't want to download the 65 Mb of Processing, or your lupu_save is running out of space? No Problem!