You'll need to download the .zip file with the original .PNG files here. They're obviously Fujifilm themed, as you can see, since they're for my Lightroom and Capture One scratch drive and high speed backup. If you're not familiar with how to change the folder or drive icons in macOS, start by saving the picture to your Downloads folder. Open the picture in Preview, hit CMD+A then CMD+C to copy the image. Right click/2-finger click the drive or folder icon you want to change and choose "Get Info" from the menu. In the upper left of the window that pops open, click the image so it's highlighted, then hit CMD+V to paste the icon, replacing the old one.