Smile While [Itch.io page] is a free project I downloaded entirely because it promised bright colours and confetti. It delivered bright colours and confetti AND noises! It's more of a mood-lifting desk toy than a game and I love it.
You click on the background to generate more noise and toys, and you click and drag to waggle the toys around or create more particle effects. I feel like this is a really useful thing for if you feel like you deserve an impromptu desk party. I often feel like that.