DIY photography linked a video by Destin (see link for his youtube and flickr page) about how to create a simple macro lens with your existing lens' simply by taking it off and holding it backwards. I gave it a go with my 50mm 1.8 and it worked! Need more work on it though but certainly fun!
A few notes - just remember you need to widen your aperture manually and it needs a lot of light! Remember as well to be extra careful with your lens (and camera!) if doing it!
Reverse Lens Macro tests
