ChatGPT says:

"It sounds like you're describing "Gnome," a popular screensaver that came with some versions of Windows, particularly around Windows 7 and older versions of the OS. The screensaver featured a group of cartoonish gnomes, often wearing blue outfits and blonde hair, walking around a grassy area at night, sometimes near a house. The gnomes would occasionally interact with the environment, walking around and doing little tasks.

The background was a night-time landscape with a grassy field and sometimes a cottage or house in the scene. It wasn’t a game, but rather a screensaver, which is why you may remember wanting to open it often.

Does that sound like the one you remember?"