Quilting is an art form in which amateur craftspeople explore geometry and color to create stunning designs. Bargello is a specific quilt style, defined by a clever construction method that imposes constraints on the designs and gives them a characteristic appearance. The current process for designing Bargello patterns is laborious and time-consuming. We have developed a prototype system in which users can design Bargello quilts quickly and easily by sketching curves with a mouse. The system has three constituent parts: an algorithm that produces visually smooth curves composed of corner-connected axis-aligned rectangles, a module that supports the creation of Bargello quilt designs, and a module that supports the exploration of color combinations using real fabric textures. We conducted a set of informal focus group sessions with quilters from the community to evaluate the system. The participants were enthusiastic about the system and also provided suggestions for its improvement.