Instructables

Instructables.com is a really comprehensive, creative resource for makers of all kinds

There area a lot of outside-the-box ideas for construction toys as well as just about anything else you can think of

Since we're focusing on the construction toys, here are some ideas for Lego, Lego here as well, Meccano, Erector Sets, K-Nex, More K-Nex, and because I like them, Armymen