I don't know about doing a log cabin. It might be hard to sign. Amma sent you some really nice blocks. If you're a really new quilter and short on time, #1 would be my choice and it would be very easy to resize the block. 2 seams done!! Do you have any idea on how many signatures you're going to get? That would determine the size of block you would want for the size of quilt you're going to make.