Your website or blog needs to have images, they help to make a site look more attractive, they help to break up long sections of text, can provide information, and with the right use of alt tags, they can be helpful to SEO. However, borgninestallon is correct, you cannot simply copy an image from another site to use on your site, even if you try to make some changes to it.
If you have a digital camera and some time you can create your own images. If you don't have the talent to create your own images, then use free sources for quality photos and images online. There are a wide variety of images available through creative commons licenses or that are in the public domain.
Even when using these free images be sure to understand and follow the licensing requirements.
If you don't find the images you want through free sources then look at the paid resources available and you will find a lot more options.
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