OS X Mavericks doesn't provide many options to change your mouse cursor. Change the cursor's size using the Accessibility options. If you want something more, you'll need to look to third-party apps to change color and style or add effects.
Select "System Preferences" from the Apple menu.
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Click "Accessibility" and choose "Monitor" from the panel.
Drag the "Cursor Size" slider to the left to make the mouse cursor smaller or to the right to make it larger.