Would someone please post a few examples?

If you use the search button you will find lots of them posted here :

http://www.quiltingboard.com/t-37168-1.htm

http://www.quiltingboard.com/t-33205-1.htm

http://www.quiltingboard.com/t-31123-1.htm

Here are the first few

What is the definition of an I Spy quilt?

Not sure of the exact definition but I take it to be a quilt made with many different patches that you can play a game with . many have no patches the same others will have matching patches but not together so you can find the matches.

You can say ... I spy something red with black dots and the child looks for something that has that :thumbup:

The blocks in the I Spy swaps are of fruits, vegetables, signs, sports equipment, animals, people, all sorts of other inanimate objects... You try and not replicate any fabrics in the quilt top.