I have created a simple Koreader icon (and Syncthing, too) to match with the Pocketbook style. If you're interested, you can download the svg file
here.
For 300dpi devices, like Verse Pro Color and Era, I exported to bmp 96px (24 bit still works, though I read else where it should be 8bit). I think for 212 dpi device, 64px should work.
