How can i add themes for Google chrome? if anyone knows?

i wanted to know because adding some themes to the site seems cool and im pretty good at making art over the internet. so if anyone can give me step by step that would be good or if anyone knows a link to help me achieve this.|||doodle for google...google it lol|||mnvgkh|||http://www.mychromeaddons.com/create-chr鈥?/a>