Nine patch quilt blocks are numerous and likewise, the "sister" block type -- the Uneven Nine Patch. Both can be simple or challenging, depending on the number of pieces in each quilt patch.
Nine patch blocks are comprised of nine units, laid out in three rows of three patches. This is probably the most commonly used type of quilt block made.
| Nine Patch - Uneven|
Nine Patch Square - Variation
Free Quilt Block Pattern
The 9 Patch Square - Variation quilt block is built on the Nine Patch Square -- a logical assumption. The difference between the two blocks is that the centre in the Variation version has a four patch unit rather than a single square.
In any case, both quilt blocks are effective as evidenced by the illustrated quilts. No difficult patches to make -- just colour choices can make all the difference in the end result.
Related - Nine Patch Square