In my "junk box" have some Red indicator lamps, but No Green or Blue.
LED's with built-in resistor available on Ebay Red/Green/Blue/Orange
http://cgi.ebay.co.uk/ws/eBayISAPI.dll? ... 050wt_1141The 5mm size just fit inside the existing RED lens.
If they are too bright, some "black felt tip" attenuates some what
See photo results
LED as purchased
LED with heat-shrink suppport
LEDs OFF
LEDs ON