When using various flash drives, hard disks and memory cards, I like to have them with respective custom icons in Finder in place of default image. So I made my own icons for frequently used devices. It's quite easy to do with iconutil. If you by any chance use the same devices, feel free to download ready icons in macOS .icns format.
Recently I have bought a designer USB flash drive Leef Surge. It features an extremely compact design: USB plug is followed by a small cylinder actually containing flash memory. This flash drive is of the size of MacBook power plug, so you would not like to unplug it from your laptop.
For now I'm introducing an icon for Leef Surge USB drive.
ICNS format (for OS X)
Sizes: 16×16, 32×32, 128×128, 256×256, 512×512, 1024×1024.
File: LEEF Surge.icns (1.5 Mb), free usage.
ICO format (for Windows)
Sizes: 16×16, 24×24, 32×32, 48×48, 256×256.
File: LEEF Surge.ico (80 Kb), free usage.