They also come in warmer colors.
This is one of my Sapphire 25s, modded with a Nichia DS Warm LED. The tint is fabulous. Here it is next to a stock Sapphire 25:
I've been carrying this for a while now, and while I'm generally not a fan of warm tints, this LED has great color rendering -- the best of any 5mm LED I've ever seen, actually. Despite how warm it is, blues actually "pop" quite well when illuminated by this light.
The beam is slightly narrower than stock, but it retains the exact same beam pattern.
I bought these LEDs in 2010. Now I feel kinda foolish for not trying them sooner. It's pretty much perfect.