Check out these great examples (including TAB) of songs that make use of 7 string guitars. See how different guitarists make use of the seven string’s extended range and try some riffs out for yourself.
If you’re looking for a versatile 7 string guitar, check out this review of the PRS SE SVN. This 7 string guitar makes some big improvements over the past PRS 7 string guitars. Find out why I use this as my main seven string guitar.