Frugal Fun 4 Boys and Girls has so many cool ideas for LEGO builds, projects and activities, like this tutorial for making a marble run out of LEGO bricks. The cool thing is that she provides plenty of helpful tips and ideas for how to make it, along with photos of the one she built, but does NOT give you step by step instructions to build it exactly the same way. That way, kids can enjoy the challenge of a making their own unique and creative LEGO build.