Some ad units, which can contain both an image, and text. These are great for pushing important aspects of the site.
Go to Marketing > On-Site Advertising > Campaign Groups, and set up a new advert group called "ad_units".
cms/home.template.html, copy the advert code below and paste it directly below the existing text advert closing tag (
[%advert type:'text' template:'text' limit:'10' ad_group:'ad_units'%] [%param *header%] <div class="row"> [%/param%] [%param *footer%] </div> [%/param%] [%/advert%]
For example, absolutely position the text of the advert so that it sits over the image itself, rather than below it.