One thing I use spoons on walleyes for is targeting suspended fish. Through the ice, we are using cleos and Swedish pimples tipped with a minnow. Once, about 15 years ago, I saw on the finder what I thought might be walleyes suspended 15 feet down over 30 foot bottom. I thought about ice fishing techniques because of the vertical presentation. Lowered a silver/chartreuse cleo and wham! Fish on! This has turned out to be a reliable pattern on tanic stained rivers I sometimes fish. The walleyes are often suspended at transitions in structure (although sometimes way out over a deep basin), but always about 14-18 feet deep on my local river. Spoons can be the trick and these fish seldom see any lures - either shallow cranks are too far above or jigs on the bottom, both missing them.