I want to make a large afghan throw blanket but I'm having trouble finding a pattern

I have been looking for quite a while now and tried 13 different patterns but I didn't like any of them either they take up way too much yarn they have too many holes for toes to snag or its way too complex to repeat 40 times. I am still pretty new at crochet so this is honestly a little ambitious and overconfident but I need to make this blanket before June 28th for a gift.

I need a free pattern for a Afghan block or granny square that is a 9x9 squares or bigger because I don't want to make 150 squares. Most patterns I have found were 12x12 squares. I want at least a few colors at least 3 at most 5. Does anyone know of a pattern like this ?