A number of  microstock sites offer free downloads as a way to give you a taste of the types of images and image quality they offer. It's not a bad idea for designers on a budget to peruse these offerings now and then. Most notably, Dreamstime has a rotating selection of seven images available for free download at any time. Log in to the main page and look for the "More Free Photos" link to see all seven. [Click here for the mainpage ]