Prescription glasses with round lenses (I bought this pair: http://www.zennioptical.com/cart/product.php?productid=815
for $9.95. If they are not available anymore, search around the website and you should be able to find a suitable pair).
If making non prescription lenses, either use plexiglass or you could potentially find pre-cut glass circles (used in photography I think).
Dremel tool with a sand grinder
Black Model Magic air dry clay by Crayola
soapy water (should be in a spray bottle, but I just dabbed it on)
Exacto knife or box cutter
Circle cutter or compass
Hole punch (1/8'' hole)
Limo tint - can be bought in huge rolls, but you possibly could find some scraps at a place that tints windows or on ebay. Or PM me. I have a huge roll and I could potentially ship you some if you pay for shipping.