As in Nightmare Before Christmas that is. In my family I just call it Nightmare, but in fandom it's NBC.
The window seat came with the house of course, but it was bare wood and it's original to the house, or near so. ( My house started in 1913, and it's been added to at least 3 times, maybe 4? It's kind of a Frankenstein house which is yet another reason I adore it)
This change I think adds much to my dining room. I bought the pillow shams, and then pillows for them. The padding is just chunks of foam cut to fit, and I found extra long pillow sheets to use as the covers-- making it an affordable house upgrade. Since the pillow sheets can be washed as needed, easy to clean as well. I believe this cost me around $120 total. It's comfy as well!
The cats adore it! during daytime hours you will find one or 2 of them snuggled up in the sunlight.
I'm hoping in another year or 2, we can redo the cabinetry in the kitchen to fit my theme. As it is, I have several of my favorite Nightmare toys on display in the dining room and kitchen.
I really love my home, and I'm so grateful I can add and subtract things to make it special!