It would be good to have an import option in "Design icon" dialog box to import custom images and customize further as per need. It's hard to design complex logo pixel by pixel.
I do not like the idea that IBM has to spent their precious time to implement functions of other packages.
When you import a logo that has a different size, it will need resizing and that process can better be done in another package. Here you can resize your logo to 32x32 pixels and copy and paste it in your Notes designer.