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.