I have to admit...
After everyone (who left a comment) told me that Muslin would indeed be too cheap, I started to think about what I have in the stash that I could use instead...
I have a piece that looks like a book binder print that is creamy - like a white cat or a Westie... (See there I was fair to the dogs. Also my dad's daschund just had puppies.)
& then I thought about actual Diawabo Taupes. Not the woven ones that sell for up to $20 a yard, but the normal ones that sell for $13 a yard. & then I thought about that niche seller who sells though a paper newsletter. (Yes, I am serious.) He had some for eleven something a yard...
After searching for the paper newsletter as .pdf on the internet & then asking my husband to find it for me, I e-mailed him to see if he had any left. (Paper newsletters do not count down how many yards, if any, are left.)
I was in luck he had some in each of the 3 color ways. With a big enough swath (I figure 9 yards of the cutting it close side) for me to buy in 1 color.
I bought the rest of the bolt, which ended up being 11 yards & 7 inches. AKA more than enough.
So now the who quilt will be 100% Daiwabo Taupe. (& for those of you doing or not doing the math out there - It will officially be "The World's Most Expensive Quilt.")
Now to start piecing, right?
FYI, the print that I bought is like (if not) one of those star prints below.
The seller called it gray - I didn't care. I figured that any one of them would have worked just fine.