I just looked up the pattern (I have to book too!) and saw that without adjusting the block sizes, the only way to increase would be to add more borders and I am afraid that that won't look right. I don't think you want to mess with the pattern of the bargello either. I would double the size of each block. It will keep the integrity of the pattern intact. That means that where the initial strips to be cut are 1-1/2", cut them 3". And on the strips for the pattern, double that as well....so where strip numbered 1 is 3/4", cut it 1-1/2". If I am wrong, please somebody jump in and correct me.