I really wanted an orange Pixel XL, but needed a phone NOW. Rather than take the time to track down the right color, I took the black model that was in stock (not as boring as I'd feared but still), and went for an orange case. There are a bunch of nice ones out there, but I'm giddy with
this one: "GVIEWIN Nature Series for Google Pixel 4XL Case 2019, Ultra Slim Thin Glossy Soft TPU Rubber Gel Marble Phone Case Cover", a description that's actually pretty accurate.
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It's quite striking in real life, and feels terrific. I also discovered that its drop protection is just dandy, having dropped it twice in the first two weeks. Yikes! Hopefully not again any time soon, but I don't have any questions about protection to go with enjoying the look and feel.
I may yet wind up getting a couple of custom skins from
dbrand, which other folks on this thread have recommended. Some super slick looking options there at nice prices for folks looking to build out their collections.