The square that I made measures 72 cm. I used several different kinds of yarn - deep green, 2 kinds of natural white, and melange green and white. The thickness of them is approximately for hook no. 3.5 - 4.5, and I worked with hook no. 4.5. I used 350 gr of yarn. In the end I added 4 tassels, one at each corner, about 13 cm long. Very good instructions for making perfect tassels you can find here.
My big square will be a table runner for the dining room in my parents' home. However, this piece can be used as a baby blanket, as a pillow case, or it can be a part of a bedspread.