I worked with a class of year ones during my recent placement (I'm a student). I had to teach the children about shapes.

First draw a large square and triangle on some art paper, so you have the basis for a house shape. The children then, after looking at an example, use shape sponges to sponge a house picture, filling in the square section with smaller squares, the triangle roof with triangles (facing upwards and downwards in order that the roof is filled) rectangle for the door, hexagons/pentagons/circles/squares etc for the windows, a nice big circle for a sunshine and most importantly a rectangle chimney.

I then gave the children a worksheet in the shape of a cloud of smoke with the heading 'the shapes i have used in my picture are....'

The smoke can then be cut out and glued to the picture. It's a great display piece and the children loved the painting and the smoke worksheet encouraged them to recognise the names and spellings of the shapes they had used!