If it's just guitar I'd suggest as much as you can do. Acoustic and electric, chord one shots, simple melodies, some chord progressions, guitar chugs, the foley of the crackle of an amp. Hell if you wanna be real creative, why not offer perc from hits on your guitar(s) too?
Basically I know it's a cop out answer but basically do anything physically possible with your guitar. Obviously don't go OTT and start adding proper guitar solos and that.