I got an A-DATA flash with my Samsung eHDD and it didn't have an icon, so I traced their logo and made an icon.
The original trace is included in the .rar, just in case someone needs it.
To make it appear in Windows Explorer and other places, you need to create a file called : autorun.inf
with a text editor, but notepad will do. Add these two lines:
Save it and make it read only, because a lot of people have viruses on their PCs that alter this autorun.inf and even though you won't get affected, it screws up the icon and you have to rewrite the file.