I have been raiding charity shops for copies of Cluedo as a source of cheap figures, and ended up with a pile of spare bits that went in the bin...apart from the boards that I simply couldn't throw away while there was a possibly they could be useful!
Enter the scalpel and ruler:
And a black pen to colour the edges:
To make a versatile set of rooms and corridors for skirmish games (I'm thinking of using them with Better Dead than Zed as well):
What do you think?!