With a number of the crochet squares I am working to rehab, all I have to so is pick a color add more rounds of stitches, increasing the width and squaring up the corners all in one fell swoop.
Others are a bit more complicated.
One such square was Square F-1 from the Better Homes and Gardens Granny Square Sampler. In sorting through my “crochet squares available for rehab,” I came across this effort one-round shy of completion and seemingly unattached to any project:

It was a little wider than it needed to be, the corners were v-e-r-y round, and the edges curled up. The easiest thing to do was to frog the fourth round.
So I did:

Now all that was left was to re-crochet the final round making the square both a little bit less wide with much sharper corners. I had a few missteps along the way, but eventually it was rehabbed and ready to join with the other squares to be part of something larger than itself:

Another crochet square that needed some work was Crochet Square 16 from Jean Leinhauser’s 101 Crochet squares. It was a touch to narrow (but just a touch), and the corners were (like many in the book) rounded rather than sharp edged:

It didn’t need much, but it did need something, so I once again began with frogging the final round:

And since I needed it to be just a very little bit wider, I used a 5.5 mm hook to work the final round rather than the 5.0 mm hook I had used originally, and I added stitches to the corners to square them up. In no time it was all done except for weaving in the ends:

I also took a moment to get group photos of these recently rehabbed five-inch crochet squares:

and these six-inch crochet squares:

As for me, I am hoping that giving these crochet squares a purpose is a sign of things to come for the new year as I continue to move forward one stitch at at time.
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Square F-1 (free pattern)