Haha yeah. It doesn't take too long. Just a matter of making sure the image is the right size and converting it to a .img file for the bootloader
Plus yours was easy to do. It's harder using wallpapers and stuff that are meant to be landscape. Yours didn't require much tweaking, Just had to fill in the background with a little extra black as it was a little shorter than 960 px.
Edit: just saw your edit. No I didn't stretch it. As mentioned above I painted the background black as there were white borders at the top and bottom because the image was shorter than 960px