How would I make a "do it yourself" pinhole lens from a body cap with light leaks?

[CamCracker]

I would like to make a pinhole lens like in this tutorial: Simple Pinhole for SLR Camera

And I can easily do that, no problem, heres my problem though. I would like to have the hole bigger to allow more lighting in. Is that possible? Instead of having the hole be a tiny pinhole, I'd like it to be bigger to let more light through so I can use faster shutter speeds.

Here is my main problem. I would like to let light leaks in for creative/artistic photos. How would I do this? Would I cut slits in the ring around the edge of the cap? Or would I cut them on the front in different spots? How would I do this?

Thank you for your help!