There was a temporary exhibition recently at the Croydon Clocktower (which
has just been very successfully refurbished and relaunched) which brought
together collections of "stuff" by residents of the London borough of
Croydon.

Collections included aeroplane sick bags, Cindy dolls, fruit wrappers,
mugs... and all the collections were displayed in a suitable environment,
e.g. the Cindy dolls were in a child's bedroom; the sick bags lined the
walls of a toilet...

I'm not sure if this is exactly what you're after. Happy hunting, all the same!

Programmes Unit
Science Museum
Exhibition Road
London, SW7 2DD

Tel +44 (0)171 938 8047
Fax +44 (0)171 938 9773