Nearly 10 years later, I have a quilt top.... I was planning on making 15 blocks originally but after I got them all out to check how many more I needed, I realised that 12 blocks would already make a decent size quilt.
After playing with the blocks to pick the sashing, I decided to add a black strip to 2 sides of the blocks.
That's when I realised that I made a mistake in the question mark block that wasn't square (17x18) so I unpicked and rectified it.
All the blocks are bordered by a 3'' grey strip.
Now the top is pieced, ready to be quilted, let's hope that won't take another 10 years....