pinhole

Aye, same to you pal.

It's Worldwide Pinhole Photography Day dontchaknow. A pierced bit of tinfoil attached to a drilled out body cap on the EOS-M was the tool of choice. 

The problem with pinhole photography and APS-C sensors is they're just not going to be that sharp unless the pinhole is very close to the sensor. For the EOS-M the flange to sensor distance is 18mm and for, let's say, greenish light the wavelength is about 550nm and the pinhole is probably about 0.05mm diameter. Using:

x = 1.22 . lambda . f / d

you get an Airy disk diameter of about 0.2mm. Fuzztastic. Now you might think that making the hole bigger will reduce the diameter... and you'd be right. If you were using a glass lens. 

It looks like the pros use a combination of pinhole and Fresnel zone plates (or just a Fresnel zone plate really).