Mouse Pointer Locator
In the release of OS X El Capitan, just shake the cursor to locate it.

From Apple:

Call out your cursor.
Lost your cursor on your crowded desktop? Just shake your finger back and forth on the trackpad or give your mouse a shake, and the cursor gets bigger so it’s easy to spot.

To enable/disable this feature, go to System Preferences &gt; Accessibility &gt; Shake mouse pointer to locate


Shake mouse pointer to locate
Quickly move the mouse pointer back and forth to make it bigger.