No problem Oldbiker, if anyone wants another car colour, just say, as it shows off my photoshop skills
Best way to fix this to your rear window is to right click and save the image to your desktop, then print off the picture onto shiny photo paper. You can then buy an A4 sheet of transparent 'sticky on one side' sheet. You then cut out of the sheet a rectangle a bit bigger than the picture and stick the picture to it.
This now means you have a sticky circumference of say half an inch on all sides. (say 15 mm). And just stick it on your back window.
PS...The above is the cheap way to do it, but you could go down the route of getting a professional print company to make it a one off sticky, but there is expense in that.