I read an article a few days ago which was showing the results of a poll of about 1400 people regarding their productivity times, and it concluded that precisely at 10:04 PM is the best time to get your thoughts straight, while 4:33 PM you probably should avoid doing anything seriously :D. You can also effectively use bathroom for increasing the chances of getting an inspiration or solving a problem.
For me personally, all these findings works as well, though my night work times are a bit shifted towards later times at night. Anyway, an interesting article and if you would like to read it, here is the link.
I have published the C++ source code for extracting robust hue histograms which is a color descriptor for image patches. You can get more information from this page: Robust Hue Histogram.
This is an interesting video showing 3 smart graphics designers which took them 4 days to recreate the Omaha beach invasion scene of the Saving Private Ryan film.