not only that, you can change the bootcamp partition's icon to whatever you want.
if it's FAT32 it's like any normal folder.
if it's NTFS, do the following steps
1. Format a USB thumdrive to FAT32. Change the Drive icon for it to the one you want your Windows drive to be. (using Get Info and cut&paste commands)
2. In terminal, go to: /Volumes/
you'll see a file named something like '._USBSTICKNAME'
duplicate it, then rename it to something like '._WINDOWSXPDRIVENAME'
3. Now boot into Windows. Connect the USB thumbdrive, you'll see a file called '.VolumeIcon.icns'.
4. Copy it to your Windows' C:\