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 can delete images from Google drive cloud using the Cloud Gallery manager which allows you to manage your contents and delete as well on the Google drive cloud.
You can easily find the images of Gmail icon. You can google it to find the red colored image. It is an image of red package.
You can send images to Gmail via phone also. You need to have Gmail signed in on phone. Then compose a Email and click on attach.
If you are asking of attaching photos in gmail emailing you can use the attach tab or if you are talking about google talk its hat you can send and also change display image by clicking the place here your user name is there is a blank box with a smiling picture click it and select change display image.
You can upload pictures from I phone to Gmail account. You have to send it as an attachment. It is stored then in your Google Account.
You can send pics from computer to gmail. You can do that be attachment service. You can click on pin icon to attach pics.
The Google widget is used to direct you to Google and give you access to what Google has to offer such as but not limited to: Gmail, Blog, Web, Pictures, and Search.
As far as I know, you cannot change Google Drive's background. You can only change Chrome and Gmail backgrounds.
You cannot create a PowerPoint on Gmail itself. There are other tools for this however. Google Docs helps to create PowerPoint Presentations.
You have to download the images first. The images should be saved on the flash drive. A screenshot could also solve the purpose.
There is no direct link from Gmail to Google. You can insert in the URL bar to go to Google. Gmail itself is a product of Google.