I made two shabby chic quilts for my daughters. they were a large twin size and had a big lemoyne star as center surrounded by 8 in. log cabin blocks. The colors were light blue, rose and creme. I found when I researched patterns it was more about the color scheme then the patterns. Often squares or rectangles are used to display the large florals, typically roses, on this type of fabrics. Robyn Pandolph and Moda have many fabrics that might lend themselves to Shabby chic.
This will maybe give you some ideas on what fabric to use and what pattern.
https://www.google.com/search?q=Shab..._AUoAg&dpr=1.1