Kate and Claudia curated these amazing "feature fabric bundles" to offer inspiration for your next project. 
Each bundle is 7 half yards. Using one of these bundles and a background fabric, I made the Basically Bauhaus quilt shown on this website. 
They all contain a wonderful mix of different textured fabrics. We paid attention to value, so most bundles have a nice range from light to dark. You'll find Japanese cotton wovens, Essex linens (linen-cotton blends), yarn-dyes, printed cottons, printed linens, batiks, and embossed cottons in these versatile sets. They are just the best for kicking off a new project. I took one of them, added just background fabric, and am creating a queen bed quilt for Kate. 
However they can also be used as a base for handwork projects, for bags, for quilted clothing... the list is endless.
This particular set contains Kokka printed cotton canvas, woven cottons, Essex linens, batik and linen. Sewn together into a project they will all play beautifully together. I don't recommend pre-washing unless you are making clothing. IF you decide to pre-wash, do so by simply soaking the fabrics, spinning out excess water and then machine drying the fabrics.