A few nice stock image images I found:
Sand Dunes - Mountains - Snow- Clouds and Shadows
Image by Striking Photography by Bo Insogna
The Great Colorado Sand Dunes. The Lighting and cloud movement was changed every minute.
www.theLightningMan.com
Haystack Mountain
Image by Striking Photography by Bo Insogna
Haystack Mountain climbs to 5,545 feet . This is a view and reflection from Coot lake. Haystack Mountain is a mountain summit in Boulder County, Colorado.
