You can find patterns and books for Chicken Scratch on Ebay, I would just make them up as blocks and then use the blocks to construct a quilt. You can also just do a border design on strips and use those as sashing or borders.
Here's some sites for free patterns:
http://crossstitch.about.com/od/chic...tch-Square.htm
http://kindawonderful.typepad.com/pi...tch-guide.html
http://www.needlepointers.com/ShowAr...aspx?NavID=677
http://www.needlenthread.com/2007/06...n-gingham.html