Easy Iron Golems (3.5e Other)
From D&D Wiki
Here are step by step instructions to cheat the system as a magic-user and make your very own iron, diamond, adamantine, or other types of golems for a much cheaper price:
1. Create a golem out of a cheap material such as pottery or wood (actually, make a few of them)
2. Open a portal to the plane of Limbo.
3. One by one, place a golem in limbo until it turns into a very strong material and pull it back out.
Note: Due to the golem's immutable form, if it was to turn into a disconnecting material such as a liquid, it will remain in a golem physique and not drift apart and destroy the golem. So if the DM brings this up, just let him/her know that fact.
This glorious idea made by Greenmaw, Dragonborn... Cleric (shame I can't use it).