Two of the included mods replace all menu icons with higher resolution versions. One uses Switch icons and one uses upscaled Switch icons. This includes every armor, every weapon, every material, every key item, and every food. The Switch icon mod doesn't include most dyed armors, though. The screenshots include several of my custom icons, but this mod only includes higher res vanilla icons.
HD icons are 3x the resolution of the vanilla icons. This pack is complete and contains all icons.
Switch icons are 1.5x the resolution of the vanilla icons. This pack contains all icons except most dyes. It does include the white, black, and pink dyes.
The other mod replaces all fully revealed map tiles with 1.5x higher resolution versions. It also replaces the fully zoomed out map textures with more detailed textures, giving the map a sharper look.
New downloads for mod developers!
Switch_Icons_png.7z is all icons in the game in 144x144 resolution in png format
Upscaled_Icons_png.7z is all icons in the game upscaled from 144x144 to 288x288 in png format
Download these and use them as a base for your own custom icons! I always use the 144x144 ones to make my own custom icons and then upscale them afterwards.
Things to keep in mind:
If you are playing the game in 720p, I doubt you'll notice a difference.
If you still have some low res icons, they are probably from another mod you have installed at a higher priority than this one.
Any map tile that includes unrevealed sections will not use higher resolution textures. But a fully revealed map will be completely high res.
Enable the extended memory graphics pack in Cemu. I've been playing with 3x icons lately and have had no issues, but if you experience issues with this pack enabled, please let me know.