Here is an HDR photo taken in, you guessed it, Central Park in October.
I've made it available in several formats for use as a device/display background as well as in printed form. You'll find links below:
For use on tablets including "retina" class devices
For use on desktops/notebooks including "retina" class displays
Links to various sizes available via Flickr
Prints via ImageKind
Prints via RedBubble
And as always, feel free to hit me up on Twitter, Google+ or Facebook.