More to explore:
DIY Cat Playhouse
Cat playhouse made out of an old T-shirt and 2 hangers
Cat Playhouse - Lowe's Creative Ideas
TARDIS Cat Playhouse
TNG cat climber. Yup.
Funny Cats: 10 Amazingly Cute Cat Playhouses
tardis dr-who -- Cat Playhouse
Pet Pals Cat Playhouse w/Ladder PP1573 - PetSmart
$83 Pet Pals Cat Playhouse w/Ladder PP1573 - PetSmart
cat tower DIY-- You could definitely make it look cuter than this but using old tables is a good idea!
DIY Cat tree I don't think I'd ever have the time or patience to make one.. But hey never say never :))