If you didn’t already notice, I changed the header image on my blog here. I know, I should have done that sooner, but I was too lazy for.
But why just now? I have discovered Inkscape. Incscape is a vector drawing program. Imagine – common pictures are using a grid which is colored the way you want it. If you resize it, the grid gets resized and you may loose information. If you are using vectors for describing images, it’s them being resized. So you are not loosing any information and the picture looks nice in any size and shape.