If you weren’t aware, Bing.com has an awesome image of the day.
Even better, they have a daily quiz(!) for every image.
I like both a/ beautiful wallpapers and b/ mini-quizzes so I wrote a little macOS menubar app that updates the wallpaper daily with the Bing image of the day and also gives you a little link where you can take the quiz.
Either download from my GitHub releases or use Homebrew.
brew tap dacort/formulas brew install bingdaily