Thinking back over my years of quilting I could only come up with two, although I have made many Disappearing 9 Patch quilts and after I became bored with those, Disappearing 9 Patch Second Generation!
The first 9 Patch I recall doesn't even look like a 9 patch! I had ventured into the realm of watercolor quilts and decided after the first one that the blocks were a wee bit small at 2" but being the OCD type told myself I had to use up all the left over pieces before moving on to a slightly larger size [2.25"] and decided upon 9 patches as the most efficient means of freeing myself from them!
I sorted them into groups of 9 from light to dark and began to sew them together, then I sewed the 9 patches together beginning with the darkest at the bottom and moving through to the lightest at the top.
Once finished, bordered and bound, it looked formless and uninteresting to me so I had to come up with something additional or consign it to the dog's bed!
The other 9 patch quilt I have made is a baby quilt in 30's repros and white.........
The white is a WOW with gingko flowers and it's quilted with meandering feathers.
Then I remembered that Sudoku quilts are actually 9 patches, larger ones it is true, but 9 patches none the less, so here is a Sudoku quilt I made for my friend MA in Brisbane, Australia.
And there you have the sum total of 9 patches for my 4 decades of quilting!