Patterned mousepads are fine for good sensors.

Probably not, unless you’re using a very cheap or old mouse.

Modern optical sensors—the ones in gaming mice and most decent wireless mice—track surface texture, not color. They take a tiny picture of the surface thousands of times per second and compare the images to detect movement. A floral print or a galaxy swirl doesn’t confuse them because they’re looking at microscopic bumps and fibers, not the big picture.

The exception is super-low-end mice with older sensors. Those can get glitchy on high-contrast patterns or glossy prints, but that’s more about inconsistent reflectivity than the pattern itself. If you’re buying anything with a name brand and a laser or “high-precision optical” sensor, you’re fine.

Your mouse might act weird on a busy pad. If it does, it’s the mouse that sucks, not the mousepad.