It is possible to display selected Top-Level Categories on the homepage.
To accomplish this, navigate to Settings >> Design Settings >> Homepage tab >> Select Streaming Top Categories option under Select Content to Display section:
Clicking on Edit Settings will display a module where this widget can be edited further:
The next step would be navigating to My Members >> Member Categories and start adding related images to each category:
The recommended image size is 400px x 200px.
If Only Show Categories with Photos setting is disabled (under Edit Settings), the category will display on the homepage regardless if it has an image added or not:
Additional Information: Homepage Section Order Streaming Widgets Gallery