This is one of my favorites - the traditional crane crossed with a Kawasaki rose - by Satoshi Kamiya
My go-to for "testing" new paper is this flower: 
It's a pretty nifty design. Is it traditional?
Yes it is! I learned this one about 25 years ago, so i had to hunt for the instructions: https://origami.guide/origami-flowers/origami-lily/
I like boxes. They are simple, useful and exist in many variation. When I started origami I loved being able to make a object that's more than decoration out of a sheet of paper. Especially when I didn't had any more place on my desk to exposed the other models.
The ancient (and modern) art of folding paper.
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