I recently finished a sampler quilt for a customer where I used a variety of different designs. Each block has at least one quilting design that is the same as the other blocks in order to keep some continuity throughout the quilt. The overall look however gives variety.
A spin feather quilted in the center squares, line dancing and feather plumes all added continuity.
The sashing around each block was quilting with diamond shapes. The setting triangles and corner triangles had the same feather quilted into them.
Some straight-line quilting was used to accent some blocks.