And the Ikea catalogue (or home inspiration magazines like Ideal Home).

You need to have a quick flick through the catalogue or magazines and tear out any pages with a room which pretty much
covers the majority of the page (its easier to manage this with the Ikea book trust me,
but then beautiful glossies don't have huge prices printed in the middle of the kitchen, so).
Then with the scissors cut a very narrow slot halfway along the long side of the card and halfway through the card.
Slot the two pieces together to look like this.

Or if you're that way inclined you can sit and watch to make sure they "stay within the lines".

It's much easier if you keep the two pieces of card slotted together and then lie the whole thing flat on the floor, that way all you have to do is make sure that the magazine pages you stick to the two facing sides are both of a kitchen, or bedroom or whatever.

Carry on around all four sides (you'll need eight magazine pages in total) and it should wind up looking something like this.

I cut two small slots near the corners at each side of the "kitchen" and strung a length of silver cord across, before hanging up a little t-shirt and trousers I cut from some old fabric. I'd picked up those tiny clothes pegs to use for hanging cards at Christmas and I've been trying to think of something else to use them for.
If you're feeling particular inspired and creative you could always color the pieces of card yourself, then cut out individual pieces of furniture, chairs lamps that kind of thing and have fun designing your very own rooms.
Update
The paper doll house went down so well in our house (it has become Toots "go to" toy) that we decided to make it more of a permanent fixture. We are still in the process of decorating her house but basically we replaced the pieces of cardboard with sheets of balsa wood. You could also use thin sheets of plywood or fiberboard (just make sure to seal all the cut edges and wear a dust mask while cutting). Best of all we're finally using up all the paint and wallpaper leftover from decorating our own home.
*PLEASE NOTE: I did not write these directions- this is used with permission from one of the blogs that I visit often --
check out See The Woods & The Trees at
http://seethewoodsandthetrees.blogspot.com/