http://homemadediycrafts.com/diy-crafts/top-10-playfull-diy-playhouse-projects/
Top 10 Playfull DIY Playhouse Projects,

Hula Hoop Gnome Home Playhouse, Bottom Bunk Fort, TeePee Tutorial, Indoor Tree House With Slide and Rock

Climbing Wall, Collapsible Cardboard Playhouse, Children’s Play Tent, Cardboard Camper Playhouse, A Playhouse

Under the Table, PVC Pipe Playhouse, Cardboard Playhouses

Source:
http://youtu.be/vB1G64Wg7gI
https://www.youtube.com/watch?v=vB1G64Wg7gI