A new look can draw a lot of browsers into your website. Because people always love to see something new. So, you can consider changing your background in WordPress as often as you like. Here are some tips for you in this regard:
Firstly, if you wish to change the background color, you will have to come to a decision about the color before you move on. So, you will have to have an image before you start working. You will have to then navigate to FTP to make the changes you wish top have. But be cautious about the image you are going to use. You can not just get a wallpaper and set it as the background. It will increase the load time of your website, making your site slower. Moreover, it will not give the desired look to your website. Because it will keep the browsers away from the important other contents of the page or related pages.
Secondly, you will have to sign in your FTP account.
Thirdly, you will have to find out a folder named wp-content. Then you will find themes and if you open it you will be able to see the theme name. Then you will have to open that theme name and you will get he option named images. If you open it you will get bgcolor.jpg. Then you will have to click it and you will see the current background.
Fourthly, replace the default image with the image that you have chosen for your blog background. Upload the image to set it as a background.