I LOVE making miniature quilts!
I second the suggestion to check out George Siciliano. He does amazing work, and has beautiful patterns for sale on his site. I own several of them, but haven't had a chance to make one yet.
Cindy Edgerton makes minis and sells paper-piecing patterns.
Here is her website. I made one of her patterns, a diamond log cabin. The logs are 1/4" wide.
[ATTACH=CONFIG]476459[/ATTACH]
And, as another poster said, you can always shrink regular patterns down. Here's one I made to be included in a fundraiser for a local hospital. It's a feathered star, and it finished at 5".
[ATTACH=CONFIG]476460[/ATTACH]