Not having anything planned, I didn’t carry a tripod with me, so here is how I made it: the singe RAW (.cr2) image opened with UFRaw (the GIMP plugin version) and saved as 3 JPEGs: -1, 0 and +1 exposure. JPEGs imported in Luminance HDR and assembled as not a very obvious HDR, edit levels for more drama and export as one JPEG. Some final tweaks with GIMP and the result is this.

This work is licensed under a Creative Commons Attribution-Share Alike 3.0 License.