-Using DK yarn, and a size 5 mm hook, create a slip knot.
-Make 4 chain.
-Join to first chain made with slip stitch, creating a circle.
-Make 4 chain (counts as 1 treble and 2 chain).
-Do 2 trebles into the middle of the circle.
-Make 2 chain, followed by 3 trebles into the middle of the circle.
-Make 2 chain, followed by three trebles into the middle of the circle.
-Make 2 chain, followed by 3 trebles, as before, then join with a slip stitch into 2nd chain of first treble. Bind off and sew in tail.
(The pattern above shows one way to create your square, but you do get a little bump at the end, with this quick pattern. If you would like your square to look seamless, follow the step-by-step pattern, which you can find here. The step-by-step pattern does vary slightly from the above pattern, in the order you do your trebles, so you will need to follow the pattern from start to finish).
And here are the yarns I used: