How to change the background color in grub?

In my case screen resolution is 1440X900. Somebody says that changing grub window resolution to actual resolution of monitor makes boot faster(but I don’t see this take effect in last versions o Ubuntu).
So I’ve changed and uncommented one line in /etc/default/grub to this:
Then to change purple background of grub I created the image, in my case just black image with 1440X900 resolution and put it in /boot/grub. So my file is:
Then I’ve edited again /etc/default/grub and puted a line in it:
then I updated grub configuration with command:
sudo update-grub
That’s all. Now grub background is black.

I found it in Ubuntu forum. 😉

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