When I make peanut brittle, I use a ziplock sandwich bag and make a bag topper. I always think the patterned cello bags look busy and the receiver can't immediately tell what is inside. That is just my opinion, of course
For cookies or squares, I do use tins. And because they look nice anyway, I generally don't add more to them except a wide wire ribbon maybe, and a punched tag. Plus, they are reusable.
I have seen really nicely decorated packaging and they look great. My personal taste leans toward simple and the main focus is what is inside.