Re: Blocks and bells....
I've got 3 bells on my kit, which I place on top of cymbals (with a felt in between, of course).
Bass drum mounted cowbells are quite common, but I'd also look into pedal mounted cowbells as well. Gibraltar sells a device which allows you to clamp a pedal to a mount, on which you place a cowbell, block, or anything you wish, really.
+1 for the hi-hat mounted tambourine.
"God is dead." - Nietzsche, 1882
"Nietzsche is dead." - God, 1900