Howdy,
I made one today
4 x 28p Yellow LEDs with a 60 degree view angle.
1 x 10mm x 2mm Alloy sheet from B&Q
i went for yellow LEDs ans they show up best on my Phillips 840k cam. I did not want to use blue or white as they are too bright and will reflect off my monitor. Also high power LEDs have low viewing angles 20 - 30 degrees. Also my local LED supply place only had 3 5mm IR Leds in stock.
All the rest of the stuff I had in my component box. The alloy was measured, cut and bent to shape. Then Expoxied together. Leds were soldered up and the whole lot is mounted with heat shrink tubing. I also covered it heat shrink to avoid painting the alloy which is shiny and will reflect light.
It looks a bit like a scorpion
I have tested it with FSX and it is awesome! Rather than use the PPJoy interface which I could not get working (hat switch), I am using mouse emulation. While flying hit space and look around - It makes a massive difference to flying.
So now I have to make the decision to get a 3rd 24" 2407 and a Matrox Triple head for amazing gaming!
Here are the pics. If I can I will shoot a video of FSX working with it. BTW I also tried FSX with a single light source, and that worked too

Just get a cheap LED keyring torch and mount it on a cap
On my Sea World cap (I don't own any "cool" caps), sadly my NASA cap has a white edge and that reflects light