Forms is a very popular service from Google that allows users to create and manage online forms easily without any extra technical knowledge. Google introduced custom themes feature for Google Forms, that means from now users can set their own images to Google forms background or users can choose the themes from wired list of of in-built themes.

To set custom themes for your Form please follow below steps.

Go to Google Drive, Click on Create button then select Form
Now create your Form, if you want to change the default theme click on the Change Theme option in top menu

Now choose the theme which you want to set to your form

Finally Click on Send Form and share the form. That's all!