I believe it’s the Chameleon Plant, which is a type of ground cover I see various places.

Ubuntu was my first when I started poking around with it. Not sure which version, but it was during the Unity era. Pop!_OS was the one I started using when I switched full time. I’m still using it on my main computer, but I’m also using Fedora, Ubuntu, NixOS, and Mint on other devices because I like variety!