SPAMera | Chris Keeney Photography. No explanation necessary!
Dirkon. Another free pinhole camera printable, I haven't downloaded this on myself but I love the look of this one! The Is site has also got plenty of useful pinhole making info if you want to make your own from scratch.
LOVE this pinhole camera teapot on Silverbased.org. Click through to their blog to see some of their great pinhole shots and a Pinhole Making and History 101.
The Pinhegg – My Journey To Build An Egg Pinhole Camera · Lomography. Not exactly a Saturday afternoon make, but I love this idea from Francesco Capponi
Get Ready for Pinhole Photography Day
As ever @photojojo has got pinhole camera day covered. This is a matchbox camera, google can help you find out how to make one too.
Sealed Pinhole Camera from Feeling Negative. I like all the printables you can get but when I imagined making a pinhole camera this is more like the mental picture I had.
A free template and instructions for this understated but brilliantly devised pinhole camera can be found on crafty photographer @francesocapponi flikr feed.