This back-end OFBiz theme is bootstrap based and offers 4 colour variants. As an example :
For more information about this component visit the product page in the OFBiz WIKI, which can be found at https://cwiki.apache.org/confluence/display/OFBIZ/Visual+Themes+Gallery
The Rainbowstone theme dynamically downloads the Quicksand font licensed under the SIL OPEN FONT LICENSE (no license issue)