One really cool effect you may want to try is to reverse a track or segment to play backwards. It's easy to do, and you can always reverse it to play forwards again if you don't like how it sounds.
To reverse a track or segment to play backwards
In the Timeline, right-click anywhere within the track and then click Reverse. To return to playing the track forward, right-click the track and click Reverse again.
To check if a track or segment has been reversed, look at its title bar. If you see "<<<" on either side of the title, the track or segment is set to play backwards.