A recent release to Ultra provided an option for two views on the Courses page - list and grid. The grid view displays course cards, which are made available with default images that can be changed. See below:
I've heard from some customers that they'd like an easy option to change these that doesn't require creating an image in the recommended 1200 x 300 pixel size. One of our awesome SEs, Jake Webb, created a set of simple course cards that match the Ultra color schemes - and I wanted to share in case they are useful. Using them gives you something like this:
The attached zip file provides multiple options.