For a review of crop formations that occurred in 2005, the Crop Circle Connector has an excellent database of reports and photos, such as the pictured image taken at Avebury Manor in July. View UK photos(1)/international photos(2).

1. http://www.cropcircleconnector.com/2005/2005.html
2. http://www.cropcircleconnector.com/inter2005/inter2005.html