Crocheted Blanket (Update #2)

I have been trying to crochet a blanket with granny stripes, but I have to admit it is getting the better of me.

First I had issues with the colours and then I had issues with the size. Now I have tension issues. Significant tension issues:


I kind of hoped that it would fix itself as I went on, but as you can see it is definitely semi circle in shape!

Oh well, I've changed my mind on the colours again anyway! Back to the beginning I go!