i don't have any pics because it's not a pretty sight! i can describe it though.
i have built up a collection of grey packing foam. ibm uses a great medium density dark grey foam to pad everything, so whenever we open up gear at work, i steal the packing stuff.
on the inside of the dome i put a layer of egg crate type foam. it's really thin, probably 3/4" at the thickest point. this was just the right thickness when compressed by the weight of it to get the eye slit at the right height for my head.
there's also a layer of this on the back, at the keyhole area.
along the inside of the brow there's a 2" wide strip of 1" thick foam that runs the length of the eye slit, plus about 1/2" on either side.
on both sides there is a rectangle of roughly 1.25" thick foam, maybe 4"x5" overall.
this will be revised once i add a couple of fans in there, but for now it's working out ok.
this is inside an msh2 helmet.