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I have just finished this baby-sized blanket (70cm x 82cm). It is really simple that you can scale up to the size that you want. To see further details on how I made this please see here.
I used Stylecraft Special DK (100% acrylic) in 4 colours : Magenta (100g), White (100g), Blush (100g) and Silver (200g). You can purchase this yarn here. You will need to purchase more yarn if you plan to make a bigger blanket.