I bought the fabric to make a couch size throw using the d9p. I bought two different fabrics. Do I need to add another color to have 3 fabrics? If I just use the two do I make all of my blocks the same or do I do every other one different? One more question what size do I cut the blocks? I was thinking of starting out with 5 in blocks. I hope you understand what I'm trying to ask and can help me.