Just seen this on BBC2's The Culture Show... Gary Card, set/costume designer and illustrator, in a shop for LNCC. This is made from cheap timber - the lesson is that it's the idea/feel that's important, not (necessarily) the materials. Lighting is also really important.
and another example of his work:
If you didn't see it the show is probably worth a look on iPlayer. There was also this intro sequence for 'The Kermode Awards' (these are screen shots) - idea for quick and easy sketch models?