Fun cheap equipment to play with? Canon dSLR

[Chiuy]

Do you guys know any fun cheap equpidments or scapulae to play on your dSLR? Such as the reverse lens mount, a very cheap macro flash I saw for $40, macro tube for $6. Fish eye adapter for $10. Etc.
Know any other fun stuff i can play around for under $50?

 

[Josh66]

Pinhole body cap. You can buy one for $10-15, or you can make your own for free if you have a spare body cap (or don't mind having a tiny hole in the one you do have).

How to make one:
Making a Pinhole Lens for SLR Cameras

Freestyle used to sell them (I bought one there), but I can't find it now. Can't find one on B&H either.

Oh well, they're easy to make.

 

[ChadHillPhoto]

Amazon.com: Opteka Voyeur Right Angle Spy Lens for Canon EOS: Camera & Photo

This is fun and inexpensive if you like candid people/street shots.

 

[usayit]

Has the lens baby 2.0 dropped enough in price to buy for $50 used?

It's kinda fun and creative.