Jack, you can adjust the dashboard’s overall tile size to “Tiny” and make all tiles, except dashboard tile, twice bigger to achieve what you want. And in each dashboard, you can choose different color for the dashboard tile you are currently viewing to give you the “selected” tab look. You can of course adjust the tile size, add space between the dashboard tabs and other tiles however you want, and here is a quick example I just put together.
You should definitely check out other dashboards shared in the community to get some inspiration, and don’t forget to share yours later too. 