Well I finally got round to finishing the kitchen window using the chalk pens. Here is a picture before I started....

Here is the window afterwards. I just drew baubles and stars all over the windows and  made some paper snowflakes to dangle down from each window.

This room definitely feels a lot more festive now and I would highly recommend the chalk pens. My girls have loved doodling christmas designs with them too. I also brought this great christmas star garland from Funky Frills UK