A friend just pointed me to this site, Illustrated Etymology, where creative types illustrate the histories of words, as researched by the incomparable Douglas Harper on The Online Etymology Dictionary.
What a great project to do with kids: choose a word to investigate, research its history and relatives, illustrate, and explain the development to present-day sense and meaning.
Go get lost here for a bit, maybe think up your own.
Late 14c., flowering plant (Iris germanica), also “prismatic rock crystal,” from L. iris (pl. irides) “iris of the eye, iris plant, rainbow,” from Gk. iris (gen. iridos) “a rainbow; the lily; iris of the eye,” originally “messenger of the gods,” personified as the rainbow. The eye region was so called (early 15c. in English) for being the colored part; the Greek word was used of any brightly colored circle, “as that round the eyes of a peacock’s tail” [Liddell and Scott]. Illustration by Daniel Dickson