Black is one of the theme of Gmail inbuilt. You can change your Gmail to black anytime you want. In the settings, there is themes where you can select it.
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You have to attain a minimum age to make a Gmail. The age of creation of Gmail is 13 years. You can easily create a account after that.
On Gmail you can make a little face that you prefer. Gmail supports a number of emoticons which are used to express different feelings.
You cannot make audio call on Gmail. However video calls are possible in Hangouts. It is the latest IM of Gmail service.
You can make a Gmail account for yourself easily. You just have to register using the Gmail information. You have to also agree to the terms and conditions.
You can see the Gmail messenger inside the Gmail account. You have to be a part of Gmail to see it. To be able to see it, you have to enter your details.
You can select a theme from white and black and can customize. You can add your own background. It can be from a URL, picassa or anywhere in your drives.
You can make forms via Google forms. It is not included inside Gmail service. However, the same credentials goes into form as gmail.
You cannot make a call on Gmail. Gmail is a pure mailing and chatting service.It could be done via other calling applications.
You can go on gmail and make a free account by going on gmail and clicking free account.'
You cannot make a brochure on Gmail. It is only a website for sending and receiving mails. You can make brochures on Word.
There is no issue if you do not have any existing ID. You can still make a Gmail account. All you need to do if fill your personal details right.