All you need is some bricks - which I picked up from TradeMe or you can get from a Demolition Yard, and a sheet of 1200x1200 board - which I picked up from Bunnings and they can cut it there for you if you don't have the tools at home.

Then I just painted everything white! You could paint the bricks any colour (I was going to paint them bright blue or pink, but because I'm using this in the gallery, white is suited best).

You could totally do this with bits of old wood you might have lying around, and also bricks, there is usually always someone that has some that are not in use.