Based on the old "Windows X" concept designs, ModernX offers a flat, colorful, and highly visible cursor set. It comes in multiple accent colors—blue, red, green, orange, and violet.
Perhaps the most popular open-source cursor set. It offers a material design aesthetic with rounded edges. It comes in various "flavors" like Amber, Classic (Black), and Ice (White). Find it here: Bibata_Cursor on GitHub windows 11 mouse cursor github link