Took the time this weekend to craft a homemade body-cap pinhole lens.
1.) Body Cap
2.) Cheap 52mm filter
3.) Pepsi Can
4.) Poster Putty/Blu-tack
5.) Sticky tape
1.) Drill a hole through the center of the body cap.
2.) Cut a section of the pepsi can small enough to fit inside the diameter of the body cap
3.) push a pin into the middle of your pepsi can section - not hard enough to go through, but enough to make a dimple on the other side.
4.) Sand/Grind on the other side/dimple until you can see a small hole - best to check by holding up to the light.
5.) tape the pepsi can with pinhole over the hole drilled in the body cap - keep the pinhole in the center of the drilled hole.
6.) to stop the camera sucking dust through the pinhole - and it will - line the edges of the body cap with the poster-putty and stick a cheap UV or Skylight filter on it.
Depending on how much of the materials you already had - you will now have a free to approx $12 pinhole lens to play with :)
While everything will have a pleasant soft-focus - you'll find you have an infinite depth of field - basically anything from the pinhole to infinity will be 'in focus'