Colourful pillow case

Two weeks ago I learnt from a tutorial in the internet how to crochet granny squares. Those things are quite trendy right now and people make colourful blankets and pillow cases and bags with them. I had a pillow which lacked a pillow case and looked boringly white, so I tried my luck with those granny squares and did 32 of them which I sewed together. The result is a colourful pillow case which I really like a lot. And I found out that those granny squares are not difficult at all to crochet. Mine are of slightly different sizes though because I am not used to crocheting and tried out different ways to hold my hands resulting in some tight squares and some loose ones.
Here is the result: