…but due to a Wordpress updating foul-up, Silverbased.org may not be restored for some time. There are some Wayback Machine copies available, but you might need to click around to different dates in order to see all the images.
The URL above refers to the post Pinhole 101: Background & Pinhole-Making
You can hack a cheapie plastic 35mm camera into a pinhole camera following instructions here:
DIY: Plasticam Pinhole, Part One
Part 2 can be seen at DIY: Plasticam Pinhole, Part Two