DIY bokeh shapes via How About Orange
DIY studio style snoot for lighting via Digital Camera World.
---- More DIY Ideas ----
DIY ring flash via Flickr / Trazomfreak.
Make your own lightbox at home using paper and a window via Digital Camera World.
Create photo haze with a sandwich bag via Handimania.
Turn your phone into a shutter remote with Trigger Trap via Trigger Trap.
Make your own rain-proof camera bag via Cnet.
Bounce the flash with a business card via DIY Photography.
Make a light diffuser from an empty milk carton via Digital Camera World.