Take a toilet roll tube (or a kitchen roll tube for a taller house) and draw on some windows and cut out a door
On some paper (or a leaflet as shown in this image) draw a circle - I've used a plastic pint beaker to draw around here, and cut it out
Cut a slit in the circle, to the middle point. Then overlap the cut part to make a cone and glue/tape it
Glue it on to the tube house
These can be left plain or decorated however your child likes. They could even make a whole village of them!