Here's a funky and somewhat fun game that's similar to solitaire but with a twist.  The info on Apple's website says:

A solitaire game. Arrange all cards into 13 piles, so that each pile has 4 cards of the same rank. You can move a card to an empty pile or to a pile with less than 4 cards on it, if the top card of the destination pile has the same rank as the card you want to move.

 I liked this game but it took me some time to understand it.  If you like solitaire though you're going to love this.