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This set of twenty-three replacement icons for OS X Yosemite was designed by two high school-age aspiring designers. They can be downloaded for free, and Sketch source files are available for US$5.
I’m not entirely sure if these were a class project, or if the designers were actually in high school or what, as the information provided is pretty thin. Still, I found the designs to be refreshingly unpretentious and lightweight; they’re not reinventions of the original Yosemite icons as much as adjustments of them. Nice work, kids.
Get them at glaciericons.com.+