The chartreuse colored roof tops were pieces that came out of the scrap bag just that shape. Here's how I made them fit:
Start by matching the 'roof' to a background strip that is fairly wide.
Sew right sides together, If the strip is long enough you can assembly line the units.
Square off the sky on two sides.
Flip the roofs around and sew the other sides to the space left on the strip. You can see why you want to start with a wide strip.
Iron and trim the other two sides.
It's kind of a spin-off technique from Gwen Marston's liberated techniques. Remember these are all REAL scraps so experimentation is free!
I hope your Spring is going well!
Cheers, Claire W.