My local Asian market sells powdered sriracha sauce. If you get this in your kitchen, everything you cook will be sweet, sour, spicy, and red for about a week before it's gone. It's fucking good.
I like shichimi togarashi, myself. It's got seaweed flakes, sesame seeds, and roasted orange peel, plus the peppers. It's really good on rice, pasta, and ramen.