I'm finishing up City Block 5. The buildings are chunks of soy batik cotton which I quilted individually. I debated how to attach them to the quilted background and decided stab and stitch was the best way to get a blind stitch effect. Basically, it's an up to the front side/down to the back side stitch which is good for stitch placement through several layers but takes a maddening amount of time.
Since I don't have 5 thimbles, when it starts getting ugly, I take a break. . .I admit I don't have the patience for a steady diet of handwork but I do like having something non-caloric to do when watching TV with the family.