Hi @DeadFishy! Nice to see you posting again.
I hope some of these work for you!
http://sssvitlans.tumblr.com/post/129983477174/selaronosims-some-fluffy-blankets-and-pillows
http://enuresims.blogspot.com/2016/03/cute-blankets-pillows.html
http://sim-plysplendid.tumblr.com/post/126001618602/update-2-ok-so-sims-4-studio-changed-the-way
http://saudade-sims4.tumblr.com/post/111031824404/happy-valentines-day-heres-a-little-something
http://sim-plysplendid.tumblr.com/post/124606743342/bed-and-pillow-recolors-set-one-this-is-my-first
http://simblob.tumblr.com/post/135240042345/advent-2015-day-9-1130-jonesi-bed-blanket
http://plumbobbitch-blog.tumblr.com/
http://sjane4prezcc.tumblr.com/post/149190294396/saudade-sims4-deelitefulsimmer
https://www.liquidsims.com/finds/colorfloral-blanket-pillow-recolors-by-sarah/
http://sympxls.tumblr.com/post/157635391768/the-comfy-collection-i-guess-im-not-on-hiatus
http://www.simenapule.it/sims4/objects/download/71-objects-sims-4/1170-blanket-duvet-01
http://novvvas.tumblr.com/post/160078653156/anthropologie-bed-blanket-v2-11-swatches-download
http://novvvas.tumblr.com/post/160023960611/anthropologie-bed-blanket-v1-11-swatches-download
http://simsrocuted.tumblr.com/post/125190227439/yass-finally-done-with-these-this-is-a-set-of
https://www.simsdom.com/en/download/the-sims4/item/cactus-blanket-and-pillows-severinka-s-santorini-recolor-107500
http://sims4studio.com/thread/2945/loverats-sims-4-studio
TSR has a whole section of throw blankets: https://www.thesimsresource.com/downloads/browse/category/sims4/search/blanket/
If some of these don't work properly in the game try bb.moveobjects to place them. I'm not sure if you might need to run the Sims 4 Studio batch fix for the Cats and Dogs patch for older items to work.
