On my local forum a poster was asking for someone to paint a Christmas design on her window (quite a popular thing round here). I offered to do it but although I have done murals before I haven't done window painting. Dh looked on the web and found these which look pretty good but I would like to speak to someone who has used them first! Also the girl in question wants a disney princess and obviously there is no "skin" colour in their range so not sure what to do about that.
Or - if you have done window painting before, what have you used?