So, if you are using that bootloader, you only have to download these two files and install them in /efi/refit/icons/:
http://dev.gentoo.org/~grahl/macbook/os_linux.icns -- The actual logo you can select
http://dev.gentoo.org/~grahl/macbook/boot_linux.icns -- The washed out logo after selecting, while booting
This was just a very short GIMP trickery, so don't expect too much bling.
For people also wanting to make these icons and too lazy to google, here is what I did:
-Install XCode Tools for the icon builder app
-Convert the Gentoo SVG logo with GIMP to a format the icon builder likes, like tiff.
(-Optionally, use GIMP to make things pretty. I used a background layer with #bfbfbf and a duplicate of that on the foreground with lower opacity to make the washed out logo.)
-Import the picture created in the icon builder as a 32Bit Thumbnail, save it.
-Replace the files in /efi/refit/icons, they will be used at the next boot.
Hopefully someone can use these
