A customer just sent me a link to IconFinder which is a wonderful site filled with thousands of well-drawn icons.
Why should you as a Curio user care about icons?
Because you can download the PNG version of an icon and drag-and-drop it into a global flag set in the Flags preference panel, or to a figure's Decoration image well (found in the figure's Flags inspector) to associate an icon with a figure.
If it's a global flag then you can search on it via the Search shelf. If it's simply a decoration then you can't search on it but you can decorate your figures with colorful icons.
For instance, maybe you want to associate some figures with various social websites or different music instruments. Just download and drag-and-drop the PNG to liven up your idea spaces.