If you are building a template using the "themeable" template as a basis, you might need to make some changes to the templateDeatails.xml file. If you chaange the template name, you will need to modify the names of the language files from "en-GB.tpl_themeable.ini" to "en-GB.tpl_YOURTEMPLATENAME.ini". You will then need to change the "addpath" attribute on the params tag from "/templates/themeable/motif/elements" to "/templates/YOURTEMPLATENAME/motif/elements". For the "theme" and "theme_mobile" param tags, you will need to change the directory attribute from "templates/themeable/themes/" to "templates/YOURTEMPLATENAME/themes/". Finally, you might also want to modify the list of positions.
Note that if you change the template name, you will also need to change the names of the language files included in the template.
