Hi Paul,
My family love looking for hidden Mickey's around the Walt Disney World parks and resorts. They can be found hidden in the sidewalks, walls, attractions, murals, basically anywhere on Disney property. There is a great video here on the Moms Panel site made by Bret telling you all about them, you can view it by clicking
HERE and it's currently on page 3. The video also stars the Hidden Mickey expert Steven Barrett who has written a fantastic book all about spotting them, you can find this for sale at all good book sellers, through Amazon and I've also seen it for sale in the parks.
You can find further information at
www.hiddenmickeysguide.com and
www.hiddenmickeys.org
My girls have so much fun hunting for hidden Mickey's whilst at WDW and a few of their favourites are on the golf ball on Soarin in Epcot, the tyres in the queue for Test Track and they love finding tiny hidden Mickey's in the bedding and carpets of the Disney resorts.
Be sure to keep your eyes open wherever you go and happy hunting!
Jo