To get the same colour as the blue back drop, I took a screengrab of the desk top and cropped it so it just showed the blue colour. You can resise the image to whatever your desktops are using. This prevents the "blue box" around the icon labels as it is all from the windows settings (Saved me trying to find out the exact blue colour)

I have also addes the year groups to the top right hand corner so staff can identify the correct years are logged on. (In the case of pupils staying logged on after leaving the lessons and a differnt group coming in.)