Requirements brainstormed by students:
House with pointed roof, with door and 2+ windows
Chimney with smoke
Blinds in windows
done as a blinds() function
4+ Puffy Clouds
done as a cloud() function
Tree with n (tbd) randomly placed leaves
done with a random_leaf() function, with randomly-coloured triangles for the leaves
Sun or moon, with "rays" for full marks