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Use the Electro-Harmonix POG Polyphonic Octave Generator to add one or 2 octaves up, and one octave down and blend all of them together with straight-through signal. Works on chords. Want your guitar to sound like a 12-string? The POG can do it or even make it sound like an 18-string. Fader controls for input, dry output, sub octave, one octave, one octave detune, 2 octaves, 2 octaves detune, and low-pass filter.
The octave effect was the main reason I bought the POG. I don't use it for guitar, I play harmonica through it! My rig consist of a ElecroVoice RE 8 or 10 mic, a inline compressor/volumn control into a Boss DM-2, Boss OC-2 with the octaves all the way off and ...