Bokeh refers to blurry effects in photographs -- purposely out of focus shapes that are creamy and wonderfully fuzzy. You can make your own bokeh using just some inexpensive black card stock.
This DIY lens hood and cap, dubbed the Circle of Confusion Shape Modifier, is similar to a previous one we've featured before, except this one lets you change out the "slides" or bokeh shapes easily -- so you're not stuck with just one shape. The tutorial at DIYphotography is very detailed: It tells you how to set up the grid in Photoshop or Gimp, create the squares and cutouts, and assemble it all together.
Check out the original article and the reader comments for a discussion of the techniques used to create the effects in the photos, such as setting your camera to the lowest aperture value. Enjoy making dazzling, beautiful photos!
DIY: Circle of Confusion Shape Modifier [DIY Photography]