(instrumental) Songs for two guitars?!

[no-one]

a cousin of mine started on the guitar a couple of months ago. Now I'm trying to find songs that we can play together; one playing chords and the other doing some riffs gets boring though...
I'm looking for something like In Flames "Acoustic Medley" where both guitars can play something interesting (and it is fairly easy, even for a beginner like my cousin).
Dee would also be possible I guess.

Any ideas?

[Hellbat]

Dee in stereo.