If you use your imagination, this one could be a close up of feathers from an exotic bird.
The wallpaper version is available at the preceding link.
Today's Gratitude Item: Results from last year's final exams were released today and my students did reasonably well (better than expected in a few cases). Happily there were no big nasty surprises. Last time around some of my best students who submitted really good work did not pass (dodgy markers). Fortunately, this time around things went mostly to plan.