Yes you could easily change the Google Chrome's background. It could be done by opening themes in the web store.
install an chrome extension
As far as I know, you cannot change Google Drive's background. You can only change Chrome and Gmail backgrounds.
Background apps do services in the background of Chrome. They help running some scripts on the page of Chrome.
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
Google Chrome is not a website but a web browser. You can keep Google and Chrome both at the same time.
You can not on google chrome, except for a whole theme. Which you can get on google. Otherwise, by logging in google you can put any picture as the background of the site : google. Hope, it helped.
Yes, Google Chrome will not be affected with a change in modems.
Right-click and select "Set Wallpaper". Then you can upload any image you have or use Google stock photos.
yes
Chrome cannot have user defined backgrounds. It uses the backgrounds given by the themes.
There are a number of themes for chrome too. A theme can be downloaded from Chrome store.