For my use, saffron goes into a few dishes that aren't right without it, as Sam said.
After that, it's Turmeric. Turmeric also has medicinal benefits. It is a very good source for reducing or keeping swelling down, amongst other things. Put it on my eggs every morning.
http://www.mindbodygreen.com/0-6873/25-Reasons-Why-Turmeric-Can-Heal-You.html