window painting... anyone ever tried it?

Have some free time coming up and thought it might be fun to try a new hobby slash business idea. You know all those store front windows with cute little designs painted on them for christmas? Anyone know what supplies they use? I was googling it and came across some info regarding usuing regular tempura paints but I couldnt find out what felt pens they use to draw the outlines first... any of you creative people know how to go about starting something like this? My house windows will become my hobby this holiday season I think !

I have painted windows and just used some hobby glue mixed into regular kids poster paint - dont think I did an outline first but you could use a light coloured whiteboard marker - like yellow? The stationery shop called "Smiggle", (are they just in Australia?), has markers especially for windows - colours are just gorgeous but i controlled myself and didnt buy them! Thankfully! Determined face paint and glitter collector here! haha

I always just used to layer the tempra paint. you have to do it in backwards order if you paint from the inside, I only used to do the windows for my classroom though and it was a pain to clean off too.

I was wondering about the same thing because a lot of our designs could translate into bigger designs.

D.