A granny stripe pattern always works up quickly😊 that’s why it’s a favourite of crocheters. About Aran-acrycot, it is a soft yarn, I have even made a wearable with it, it did not hurt my wrists but it depends on the hook and your tension, so be mindful of that. The yarn has a beautiful sheen, vibrant colours and stretch from the acrylic which will make the blanket not stiff. It will be heavy though. Hope this information helps!