So, instead we made some of these...
These are so easy to make.
Baking paper (the white stuff not the brown parchment paper, although I guess the brown would work just be a different look)
Scrap card (we used those ring binder dividers. Just the cheapo 45p for 10 packs. As for 8 sheets of card it was nearly £2!!! and the good thing is the divider card is little thinner so easier for littles to cut themselves)
All we did was cut our card out and stick to the paper with a good old glue stick. Then sticky tacked them to the windows.
The kids loved them and Ian spent a good 2 hours on the windowsil just watching them. Watching them do what I'm not quite sure hehe.