to get crazy feedback & oddities sometimes I drive the front end of the tonehammer very hot, w/ the AGS activated, boost a bit of treble, and run that into a chorus...then I can play with the chorus rate to make it warble up and down and get fun sounds from the feedback.
I have an old 70's unit called a Quadra Sound Blender, that is basically a tremelo/echo/reverb unit that I can thrash around to get some Floyd like sounds...I can do the One Of These Days sound with that pretty well. it also feeds back as much or as little as I want it to, and I can crash the reverb rather easily by jiggling it around with the handle.
Some wild stuff in some of the improv parts in my surf band.
"I pay the band what it takes to keep them and keep the rest."