The PhotoDropper Plugin accesses photos on Flickr. There are millions of images there, and many are licensed for free use, as long as you credit the photographer. Once this plugin is installed, there is a search box on the page where you write new posts. You enter a search word or phrase, and PhotoDropper looks for images that might match on Flickr, and they must allow you to license them.
Your blog is a commercial blog for business, so we'll be sure to set PhotoDropper up later to look only for images that license for business use. There are plenty of them, and this tool will help you spiff up your posts with images.
Download the plugin to the Demotown > plugins folder.