The backgrund of Gmail can be changed by themes. There are various custom themes available. Blue, black, green, planets, grass etc are some examples.
They will normally would get a email from them and it would be called 'Welcome to gmail' and click on it and press 'Customise gmail'. It will show lots of backgrounds you can choose from and when you choose one and your happy. Press save and it will save it so when you go on gmail next time. There will be a background. NOTE: You can change it any time by going on that email.
You can change color of text in gmail. Go to settings in the upper right corner. Select Labs and select Default Color styling to change color.
The color of the star in Gmail remains the same. It would be yellow always and will not change. The yellow start shows which mail is important.
go to layout, then click on color (it has a picture of a paint bucket) and click on a color to change your background
Click on the "settings" link in the top right of the page. Then click on the "themes" tab on the right. Click on the one you want.
Chameleons do not change color to blend in, the change color according to their mood.
shading
Chameleons change color by temperature not the background. so,nothing it has no effect.
You can make your Gmail background different by applying themes. These themes have interesting backgrounds in it. You can also upload a manual background.
As far as I know, you cannot change Google Drive's background. You can only change Chrome and Gmail backgrounds.
Click on the gear sign in the top right corner. Then click on Mail Settings, and then Themes.
It will depend on which software is being used. With iPhoto it is not possible to change the background color of a Slideshow as that is determined by the theme being used. With other software, such as FotoMagico, there is an option to change the background color in the Settings section.