Spotsy is QT Fabrics' dotted wide back, and this colorway puts tone-on-tone spots and bubbles on a mottled blue background. It's 100% cotton, digitally printed, and 108" wide, so it's made for quilt backs first but just as useful anywhere you need a big piece of cheerful fabric.
Dots are one of the easiest prints to use on a quilt back. They add interest without competing with the top, they work for kids' quilts and grown-up quilts alike, and the mottled background helps quilting stitches blend in. A strong blue also pairs naturally with patriotic quilts, sports-themed quilts, and anything with red, white, or yellow on the front.
With 108" of width, a single length covers many quilts with fewer seams than 44" fabric, which saves time and gives a smooth back for longarm quilting. Consider Spotsy for borders or binding too, since a dot print still reads well when cut into narrow strips.