Mokume-Gane is japanese in origin, and is a composite material formed from layers of metal of various compositions fused (welded) together through heat and pressure. High heat means you don't need high pressure, high pressure means you don't need high heat.
The whole point of making Mokume is to make an attractive metal that can be made into jewellery, ornaments, etc.
It's offensively simple to make. The setup i used to make mokume for this Instructable only cost a few pounds. (I already had the gas and the torch. Yes, you have to buy them.)
There's no picture on this page because i didn't get a picture of the finished product. It's pretty though.
A brief legal note. I am not associated with T-cut, or whichever company it is that makes is, etc.
You CAN make Mokume out of coins, but in the UK it's treason, and in the US it's scarily illegal. I'm not saying don't do it, I'm just saying don't get caught.
Step 1: Make the Stack
The really important thing in the process is to get good welds, and to stop the hot metal from squirting across the shop. To do this, we make a set of pressure plates, to keep everything locked still.
To make pressure plates, get some thin steel strap or strip, whatever you want to call it, (B+Q for UK readers) and cut about 2.5 inches off the end. Put it back onto the strip of steel, and drill holes, for rivets to go through. I think the pictures explain this best. After you've got the drilled plates, assemble a stack of alternating metals. The metals you use must have similar working properties and melting points.
Put the stack onto the bottom part of the pressure plate, put the top part of the pressure plate on top of the stack, and rivet them together. This is actually qiute tricky. My best advice to you: Be Creative.