I found a roll of yellow gingham and lace trim at the craft store and added small yellow flowers to the sides. I made the window seat cushion from the same gingham, cutting off the lace. I had some narrow lace left over from another project, which I used as trim around the seat. I used skinny sticks to trim the walls where the two different wallpapers meet and also as baseboards.
I touched up the outside paint, added yellow flowers to the flower boxes, and installed the door knob.