Download the component Template Creator CK to create your own Joomla templates.
You will find on http://www.themes-ck.com a list of free Joomla! templates that are compatible with mobile devices (Responsive Design). All these templates are made with Template Creator CK.
You will have a 30 day trial, if the software does not fit your needs you can ask for a refund*
(* see our refund policy)