Yes you could easily change the Google Chrome's background. It could be done by opening themes in the web store.
As far as I know, you cannot change Google Drive's background. You can only change Chrome and Gmail backgrounds.
install an chrome extension
You can change the google theme. Just search google theme and choose the one you like and you will have a new background for your google and google chrome
To add a background click on Change Background Image (on Google homepage), sign in to Google (or create an account) and select the image you want. Note you have to be on the same country version of Google and signed in to see the image.
To change the image of the homepage, you must have an account. Then click change background image in the bottom right corner of the homepage. It will then let you pic from a gallery or upload your own picture.
When you get to google in the bottom right hand side corner there is a button that says "change background image" click it and it opens up some options you can browse your images for one or enter the URL. But i have encountered that i will exit off my browser and come back on later and you see the image is gone.
You can't change the background of a non-jailbroken iPhone. You can only change the background of your lock screen. To do this you can just use google images, hold your finger on the photo until it asks if you want to save the image. Save it, then go into camera roll and select it as your background. Hope that helps.
You can change the background to any image as homepage. The image can be a part of the drive, a picassa album or a URL too. You can select Google Images as well.
You must first sign into your Google account, then in the bottom left hand corner there will be a link requesting if you would like to change your Background. This option is still available even if you aren't signed in, in the bottom left of the page - however you will be redirected to the sign-in page.
Right-click and select "Set Wallpaper". Then you can upload any image you have or use Google stock photos.
You can go to tools.google.com/chrome/intl/pt/themes/index.html to download themes. Just click install.