The International Modern Quilt Guild describes modern quilts as,
“primarily functional and inspired by modern design. Modern quilters work in different styles and define modern quilting in different ways, but several characteristics often appear which may help identify a modern quilt. These include, but are not limited to: the use of bold colors and prints, high contrast and graphic areas of solid color, improvisational piecing, minimalism, expansive negative space, and alternate grid work. ‘Modern traditionalism’ or the updating of classic quilt designs is also often seen in modern quilting.”
As well as exploring the International Modern Quilt Guild website, we find these resources helpful.
The MQG’s Member’s Resources (guild members only) & Modern Quilting: Know It When You See It on the The MQG site.
Make Modern, an Australian online magazine for modern quilters.
I Love Patchwork and Quilting, a great UK based magazine.