For drawing attention to your posts in the sidebar. It uses a colorful way of presenting posts (what we call quilts) as sidebar elements.
Three different instances of the Mini Quilt widget used on the Coraline Theme. While I wouldn't necessarily recommend doing this on your blog (it's probably too much of a good thing), it shows the versatility of the types of Widgets you can make with this plugin. The biggest one has large and labeled patches, the left one is what I call a "Mini Bar", and the right one is a small and label-less little quilt.
Two instances of the plugin used on the Kaleidoscope theme. The theme--by now a bit long in the tooth--is the progenitor of this color idea, and showcases how far you can take the date-to-color idea.
A single simple quilt on the new Twenty Eleven default theme.