The screenshot (showing Llyn Ogwen, Cwm Idwal and the Nant Ffrancon valley, where Yr12 are headed on Wednesday) was taken with the overlay set to semi-transparent so you can see clearly how the terrain links to the contours on the map...
Geograph is a project which is attempting to collect photographs for every square kilometre of the British Isles. They are already well on their way, although there are still a fair few squares left to "bag". There are some fantastic photos on t
here and it is worth remembering if you need photos for projects, etc.. Even better though, get registered and put some of your holiday snaps, or some pictures of your local area on the site!