Themes can be used to kick start your SilverStripe projects, and generally make you look good.
Head to the Themes area of the website to check out the wide range of themes the community has built. Each theme has a page with links you can use to preview and download it. The theme is provided as a .tar.gz file.
SSViewer::set_theme("themename");
See themes:developing to get an idea of how themes actually work and how you can develop your own.
If you want to submit your theme to the silverstripe directory then check
Your theme file must be in a .tar.gz format. A useful tool for this is - 7 Zip. Using 7Zip you must select the your_theme folder and Add to archive, select TAR and create. Then after you have the TAR file right click it → Add to Archive (again) → Then use the archive format GZIP.
Head over to the Themes Forum
Please use comments for notes, tips and corrections about the described
functionality.
Use the Silverstripe Forum to
ask questions.