On Fri, 2 Nov 2012 17:16:27 -0700 (PDT), JayPique
Depending on the type of foam and shapes you need: CNC router, angle
grinder with flap disc, and/or hot wire cutter.
A handheld router, scroll saw, or coping saw work in a pinch, too.
If you're really dextrous, try a katana. Please film it if you do.
BTW, I love your question. It reminds me of people who would call the
body shop on the phone and ask for an estimate for their collision
damage with "It's a blue Chevy, I think." as the entire details.
The great thing about getting older is that
you don't lose all the other ages you've been.
-- Madeleine L'Engle