Nine Patch Uneven Nine Patch
The Uneven Nine Patch style of quilt block is so named because not all of the nine individual patches are the same size as is the case in a regular nine patch quilt block. This style of quilt block is often used in 10" quilt block to make the math easier, but you will find this construction method in many other quilt blocks as well.

Twisted Ribbon

Free Quilt Block Pattern

The Twisted Ribbon quilt block is a seven patch design, (because it is drawn on a 7 x 7 grid), but is constructed as an uneven nine patch simply for the ease in the sewing.

This lovely block gives the illusion of its name -- a ribbon that is twisted and thereby showing the "underside" of itself.

Check out other "optical illusion" blocks:
~ Formal Frame
~ Garden Square
~ Interlocking Chain
~ Ribbon Star