Search Google for "$distribution logo / artwork". Most Linux and Android distros provide there's to download.
For example:
https://fedoraproject.org/wiki/Logo
Most distros will allow personal use under certain licensing, but if you're planning on mass print / distribution, it's a no-go unless you feed funds generated by the sale into the distribution in question. Distros are very strict about their trademark usage.
http://www.redhat.com/f/pdf/corp/trademark_usage.pdf
https://www.gnome.org/foundation/legal-and-trademarks/
If you remember a couple of months back Gnome got into a fight with Groupon over usage of the name "Gnome".