I have done several blue and white samplers by simply browsing through books of block patterns and picking the ones I like. "Quiltmaker's 100 Blocks" are also good. I have made samplers that include a variety of sizes as well as those that are all the same size. "Sylvia's Bridal Sampler" and "Dear Jane" both use smaller blocks, and I did a DJ variation in blues and white. I like a mix of blues from dark/navy to light to turquoise to gray/blue.