Have you ever had a hard time finding your cursor when a battle gets crazy? CursorTrail uses a built-in, animated model to produce a glowing effect around the cursor and a bright trail when the mouse is moved.
The options window can be opened from the standard addons window, or by typing /CursorTrail or /ct. Settings are saved separately for each of your WoW characters, so your tank (for example), can have a different cursor effect than your dps characters.
Scale %: Controls the size of the effect. Can be 3 - 999.
Offsets: Moves the center of the effect. The first number box moves it horizontally (negative numbers move left, positive move right). The second number box moves it vertically (negative numbers move down, positive move up).
Opacity %: Controls how intense the effect is. 100% is brightest, while 0% is invisible.
Defaults: There are four default buttons, each with a different set of preset values. You can use them as-is, or as a starting point for your own effect.
Note: If the cursor trail effect unexpectedly disappears, you can quickly get it back by typing the slash command, /ct reload. (Even better, put that command in a WoW macro and place its button on a button bar.)