An experiment in San Jose, CA. First try.
This image was created by shooting three "rows" of panoramas with my wide-angle lens. One for the upper buildings and sky, one for the ground plane, and one for the grass in front of me.
I stitched the photos together to make the rows. Then I stitched the rows into one large image. Then I fixed the repeating edge so it would be seamless. After that, I used "polar coordinates" in Photoshop to deform it like you see above. I had to paint in some grass for the center, fix the sky, and then it was pretty much done.
I just wanted to see how hard it was. The original is about 15,000 pixels tall/wide.