I disagree.
A red LED is/will be the standard color for armed alarm. Anything else can be mistaken for a custom LED set up for pimping out.
As far as the "blue flashing further away", go to Radio Shack and buy a 'Bright Red Blinking LED Module': #276-299. It is a 2 AA batt pack with red/black leads to a VERY BRIGHT clear LED on a small circuit board that shines red. Hide the batt pack and extend the leads (if you have to).
I have used these and they work GREAT! //content.invisioncic.com/y282845/emoticons/thumbsupwink.gif.129404938effda6ad9cca39e7f4b58a3.gif