If you have a look at the index of all free stuff on my blog HERE you will find handy diagrams for all the modes, Ionian (Major), Dorian, Phrygian, Lydian, Mixolydian, Aeolian (Minor) and now Locrian.
Locrian is spelled with the intervals: 1,b2,b3,4,b5,b6,b7, so it sounds dark eerie and unsettled. The b5 or "Diabolus in musica." the, Devil in Music as the dissonant tritone between the root and the flat 5th was known historically especially adds to the unease of the mode and it's over all dark sound.
But before that, here's 2 minutes or so of me playing widdly guitar solos!