Making photography fun is the hobby's number one requirement. When wanting to add some spunk to your picture-taking routine (and potentially come up with some seriously amazing images in the process), check out these lenses that can be swapped out for your regular DSLR lens.
Love the look of the plastic Lomo camera, but don't want to futz around with film? The Diana+ lens and adapter  can help you get that same feel in digital form.
Lomo-Fi Micro 4/3 Lens ($90)
Take your super advanced digital DSLR down a few notches with the Lomo-Fi lens  that puts a little analog low-contrast, vignetting, bokeh, and shallow depth of field back into your pics.
RainbowImaging 35MM F1.7 TV Lens ($36)
Fitting your Sony NEX, Olympus, and Panasonic cameras, this small 35MM lens  puts some fun back into your photography. Look forward to shallow depth of field, bokeh, and dreamy photos with this lens.
SLR Pinhole Lens ($50)
Beautifully lo-fi, the Pinhole lens  for Canon and Nikon cameras makes your photos look like they were taken out of a cereal box camera, but without all the mess.
Subjektiv 4-in-1 Lens ($249)
Like toting four lenses in one, the Subjektiv lens  for Canon and Nikon packs pinhole, plastic, glass, and zone plate lenses in one small lens. The Pinhole and plastic produce lo-fi shots, a decidedly diffused look with the zone plate, while glass gives you pops of color.