Acronym's animated background is made possible by the Particles particle. This particle sits in the Top section, and enables you to switch between shapes and configure the background with ease. Flip the card for more information.
Supported shapes include: rectangles, circles, triangles, polygons, stars, as well as circles and lines. You can also give it a custom configuration using JSON files selectable using a file picker field in the particle's settings. Easy peasy!