Use a template such as sea of glass or media plate thats the easy way. You can get them from boygj.com or projoomla.info/. Or you can rumage through your template css/html file and change the image files there. Hope this helps
http://projoomla.info/
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To change the background image on the Microsoft lock screen, first open the Settings app. Then, go to Personalization and select Lock screen. From there, choose the Background option and pick a new image from the available options or upload your own. Finally, save your changes and the new background image will appear on your lock screen.
On the main profile page under the user image, username and description click "CHANGE COVER IMAGE". You can then choose from one of the predefined Flickr background images. You cannot upload a custom image.
Change the <body> tag to <body style="background-image: image.jpg">. Replace image.jpg with your image.
Go to settings>Design Choose the desired background or upload an image that you want to use as your background.
Click on your profile pic>Settings>Design>Change Background image
<p style="background-image: image.img"> Replace image.img with your image.
From your main dashboard click design on the blog you want to change, then click template designer. then click into the tab in that that lets you change your background image. ask if you have any questions.
Login to the Joomla backend: - Go to site->Global configuration->System and change the Debug System on the right to true.
To change a clip art to a floating object, you can remove the background or convert the image to a transparent PNG format. Once you've done that, you can place the image onto any background or design where it will appear to "float" without a visible background.
Usually a computer background is the image or design on the desktop. The wallpaper... Click on the background with the right mouse button and select properties or personalize to change it.
Go to your tumblr customize html. Press Ctrl F and type 'background' (without quotation marks) if you find something under the .body like this: background: #FFFFFF; (or another color code) change it to: background-image: url(YOURIMGHERE); If that code is already there, then just put the URL of the image in the brackets