Ironically, companies like Ikea have started selling products aimed at people making their own furniture; the "outdoor bench made from pallets" is pretty popular, and ikea & co sell cushions just for those.
I never understood those tbh, used pallets are splintery. I wouldn't be surprised if you can buy pallets specifically made for use in upcycle projects.
fake edit after a quick search: yup, you can buy readymade pallet benches or benches "inspired by" pallet projects.
https://www.online-pallets.nl/products/pallet-bank-2-hoog-me...
https://www.karwei.nl/assortiment/wakefield-palletbank-lina-...