I think that considering that you guys are looking for houses - maybe make the happy scrappy houses
http://www.quiltville.com/happyscrappyhouses.shtml
You can make it as big as you want - I made table runners with mine :)
Warning though - they are really really addicting to make!
I also didn't make mine wonky in the end since they didn't fit in the block nicely that way - I just did them straight across, with a tree between each one :)
I think any block that is a house would be a great idea :)