I believe when most yarn artists hear the term "mitered squares", they think of knitting. I remember seeing patterns for knitted mitered afghans before I saw anything like it for crocheting.
The knitted ones start with the long edge and decrease into the center point at the other end of the square. Squares build off of previous squares so you do not need to sew anything together at the end.
http://www.lionbrand.com/patterns/L20018.html?noImages=0
http://www.lionbrand.com/patterns/L10627.html?noImages=0
Lion Brand Yarn patterns have the crocheted mitering work from the long edge to the middle point just like it is in the knitted version. However, these squares are made separately and then sewn together when they are finished.
In other places such as Ravelry, I've found crocheted mitered squares made from the small point and using increases to work out to the longer edge. These also must be sewn together at the end of the project.
Tunisian crochet, being a craft that combines knit and crochet, works the stitches in much the same way as knitted mitered squares. Each block is built on the previous row, the long edge is done first, and the rows decrease until they come to the opposite point. They can be done row by row or from the center out. I don't have the permissions I need to post a picture of this type , but they can easily be found in Google images as mentioned in previous posts.
If you prefer loom knitting, I found this website with a tutorial on mitering squares on a knitting loom:
http://www.knitchat.com/tutorials/mitered-square-magic/
Happy crafting,
Kathi
