Depending on how much I spun, I normally knit alot of earflap hats, but when I have a thick and thin yarn, which sounds like what you got, I would say if you have enough do a wide scarf in stockinette stitch, I made a scarf out of my first thick and thin and it was knit tightly so the stitches were defined and then I knit it kinda wide so when it curls it had alot of the stitches still showing

Hope that kinda made sense and that was just my suggestion for a scarf, but the only concern I would have with that would be to make sure you have enough yarn to make the length you want

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Hope you figure it out and I hope to see the finished product!!! Good Luck