well... purple looks different in camera... due to its wave lenght. ( different colour have different wave lenght speed, basic physic, example rainbow)...

from my experiance, there are 2type of purple led.
1 is Ultra violet (pure purple)
[attachmentid=685977]
( notice the led in speaker holes, memory card led, and the power led will change from blue to purple if charge)
this led also can be use to scan money, mycard and etc.
only sold in phenoptix.co.uk
this led are really rare

2nd is purple on post #391 ( kinda like purple + pink)
you can get it this in malaysia

so if you look in a picture taken from a digi cam... purple will sometime look blue or pink... but if you see it in person it will definitelly be purple

lavender is purple...
http://www.flickr.com/photos/puk_photography/2620542568/

there are also 2types of blue led
1 is aquamarine
2 is deep blue ( the 1 that i use on krainsyafiq psp)

normally shop dont reconize it...