Hi Jaques,
How your Moodle site looks and works depends not so much on the theme, but in the way you require it to look and work.
Moodle Themes are restricted in some degree to the way Moodle works, so the themes that are added to the download are the themes which will work best, such as Boost, Clean and More themes.
If the people who created your website are avaialble to change the way the Boost theme or Clean or More themes look then they will probably be able to customise one of the themes named to suit your needs.
Thanks
Mary