1. First cut out a pile of squares of your chosen material. These can be any size you want. The ones shown are 6.5 inches just because we had a ruler that size.
2. Chose 9 of the squares and lay them out to your satisfaction
3. Sew the squares together in the order you want.
4. Cut through the halfway point of the centre row horizontally
5. Cut through the halfway point of the centre row vertically
6. You will then have four pieced squares looking like this.
7. If you want a regular pattern then always have the centre square the same.
Once you have made a lot the blocks can then be sewn in rows and then those rows together.
There are some amazingly good examples and tutorials on Youtube for making this. It is called the split nine patch. My favourite quilting tutorials are done by the Missouri Quilt Company. Lovely clear videos and easy to understand. - they call this block the disappearing nine patch as they put it together randomly (as I have done here) Click here to link to their tutorial