Make Granny square blanket indeed fun. The result you can use the crochet blanket to warm the body. It would be more interesting if Granny square blanket you made have a certain theme. What theme do you like? If you have no idea yet, you can try to create an Ocean Granny Square Afghan Baby Blanket Free Crochet Pattern as shown below.
There are several supporting components to be able to create the ocean Granny square. For example, you have to make the form of crabs, Fish nemo, turtles, etc.