said 3 months, 4 weeks ago:
As @wayneliew mentioned, the Creative Commons license at Flickr is great for finding images. I switch between “relevant” and “interesting” to find the best possible link. (Pro Tip: Thanks the photographer under the photo on flickr and create a link back to your post so he/she can see it…and you can generate some additional traffic that way!)
Also, my business doesn’t always lend itself well to photos, but I’ll take out my iPhone, snap a photo of my computer or screen, Instagram it, and use that as an image. Free, and you own the copyright!