Hello lovely crafters. I'm new to crocheting and have (finally!) mastered a granny square which looks lovely (having made a few dodgy ones before now!). I've also made a small bag and some booties, so can do a few different stitches, and am planning on starting a smallish blanket (in three or four colours - or shades of blue to be exact).
Would you advise me to go for a granny-square based one, or a ripple one or (and my preference I think) a a granny stripe one?
And do you know which would use the least amount of wool? I started out with acrylic wool (cheapy, cheapy!) but have used a couple of balls of things like debbie bliss cashmerino DK / rowan something or another, having made squares for the Woolly Hugs blankets, so now realise how lovely this kind of wool is, and would love to do a blanket with it but it's soooo £££, and I don't have £££ 
Thank you.