The 7 year old son of one of my friends has just discovered Sweet Home 3D. These are his first two designs.

First try by John Massanja: http://manticore.host-ed.me/SH3D/john.png

And his second design: http://manticore.host-ed.me/SH3D/john%27s%20flat.png

SH3D files are at: https://app.box.com/s/8dwzkhxb9hrb7o980ovk2mc2j4iiht0s