Here you can see how I worked on one piece, using mainly the buttonhole stitch.
You can also do some stitches in other pieces, like the running stitches here:
I will be using running stitches in other pieces trying to do it each time differently.
At the end everything should come together nicely:
This . above - is a kind of plan.
This small houses piece where I practiced some couching possibilities will be the one for the raffle, it isn't finished yet. I will put another piece in the wall hanging but you get the idea of how it could be.
This post was to explain once more the overall idea. My ideas and plan can continue to evolve as I don't know yet how I'm going to put them together.