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brent I use the Budgie edition, so what I describe is regarding Budgie only. On Budgie Desktop Settings, go to the panel properties here your Budgie Menu is set. By clicking "Menu Icon" you can choose the custom images you saved, either it be a .png or .svg file. The advantage of a svg file is that it can fit any panel size without getting pixelated, but a decently sized png works just as well.