The demo of the GetSimple theme is here: http://www.gs.cyberpress.biz/aries/ The original free html template is from wowthemes here: https://www.wowthemes.net/marketplace/free-html-template-aries/
The background images are initially loaded as random images from unsplash.com but you can over-ride that and assign a particular image to a particular page.
Mobile First, responsive, single level of nav, Two page templates. Bootstrap and font-awsome all working.
Normal theme. Unzip, upload activate.
For specific banner/background images make a component, name it background-slug and in it save the URI of the image you wish to use as a background for that page. A fuller explanation is on the forum thread.
I removed the file contact.php which came with the free template. The other original html files are left in for ref.
There is a homepage.php template which includes a gallery and the GS sidebar as a secondary content block. template.php is the default template.