As soon as I installed jasonatepaint's Rostock LED light ring, I was in love with this idea. I used the 1 watt LEDs and resistor he suggested and it was great. But the LEDs were so bright that I saw spots. I made little light shields for them using tape.

Here I have copied his design, making most of it a little thinner and adding light shields around the LEDs so they don't blind me anymore. It's like recessed lighting for the LEDs.

2014-06-07: Included another stl without all the backing. A bit simpler than the original since everything goes in from the back, no support, no tape. I've been using this for about 9 months and I prefer it over the other one.