It is actually a quite simple process, but you’ll need to have a Google account if you want to get rid of today’s logo. Once you have that, click the ‘change background image’ in the bottom left corner. After you have signed in, you can select a new background from Google’s list in the public gallery.

While you won’t be able to choose a plain white background from Google’s menus, at least you can change it from the interactive logo on today’s homepage. Another tip is to choose the ‘from my computer’ option, and create a white canvas in paint – but that is taking it to the extreme!