If you are more artistic than literary, you can take part in creating the Xubuntu desktop looks by contributing artwork and helping design the various aspects for the next release of Xubuntu.
The Xubuntu team is usually planning or working on at least some artwork projects for the release. These projects can be found in the Roadmap. It is primarily encouraged to help the artwork team with these projects.
If you wish to contribute new artwork ideas to Xubuntu, please send your ideas on the Xubuntu developer mailing list for discussion. Sending new ideas is especially useful in the Planning phase of a release. Please note that messages that contain large attachments will go into the moderation queue, so it’s encouraged to start with an introduction email without attachments.
If you have some artwork, specifically themes for Xfce ready, you can also send them to Xfce-look.org to make them available for a wider audience.
If you have found a bug in the Xubuntu artwork, please see the bugs for xubuntu-artwork at Launchpad.