Just thinking.........

If you're using just single LEDs then a 1A Darlington driver
may be a little over the top. A logic buffer would do you just
as well, eg 4050 or 7407 o-c output if you wanted to use any
unregulated voltage available

http://www.cedmagic.com/tech-info/data/7407.pdf

Also, check out the power specs for the PIC. If you use high-
efficiency LEDs it would be possible to make something
absolutely blinding (like some bastard did to me the other
day with super-super-bright greens - they hurt) which is well
within the PIC's current capabilities

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