How to expand one pattern repeat
The usual way to combine these 'squares' is to make many and stitch them together into a blanket.
In your irregular 'square' you may find they do not fit together well or at all in the usual pattern.
You can try out how the pieces fit together by cutting out a series of paper versions.
Select your pattern, make at least 10 realisticly shaped paper (or real) pieces and play around with them. Try using them at other angles as well. It may work to turn part of the pieces 45 degrees.
And do not forget that if you crochet them together you can make shorter or longer stitches, bridging bigger openings if needed.
And there is the option of combining 'squares' or different models. The one you show have points sticking out in the middle of the sides, there might be corresponding pieces which are having 'cut out' bits that would match.
Some blankets pieced together from crocheted pieces have bigger and smaller squares, it might be that there is a kind of matching piece in the book that is not obvious as the size is different.
And in the end, it is well possible that the writer of the book did ignore the 'making the blanket' as they did not intend these pieces to be actually used. Which does not stop you to be creative and still use them, but you will have to make your own matching pieces or filling connection patterns.
Alternatively, if you see a pattern in the expanding 'squares' you could keep expanding the single pattern till big enough to become a blanket by itself.