This is an artsy-ish version of Cherry tree blossoms (this photo was featured in my credit union's monthly newsletter last spring).
This is a very close crop of some crocus petals, with a canvas texture added during post processing.
If you're interested in learning how to showcase randomly rotating header images for your blog, you should check out the website/blog Tips for New Bloggers. That's where I got my code from. There are probably other variations on the same theme out there, but I found some other helpful stuff on that site, so that's why I recommend it.
What kind of "code hacks," if any, do you use on your blog?