Walk into any Mexican panadería, and there are plenty of them around here, and I guarantee your eye will be caught by a colorful array of conchas. This sweet roll, whose name derives from its sugar-paste topping scored to resemble a shell, is the most visually fun, and maybe the best-known, pan dulce of all.
You might notice that the colors of my conchas are more muted than those you often see. Not being a big fan of food coloring, I experimented with more natural ways of coloring the topping. I used (clockwise from upper left) coarsely ground cacao nibs, dehydrated raspberries and blueberries (finely ground in a spice mill along with a bit of granulated sugar to keep them from clumping), and acai berry powder:
This is how the corresponding finished conchas looked: