Occasionally I use place holder images for web projects when an image asset has not been created or signed off yet. Often this would entail locating a random image online or even creating a temporary one with Photoshop.
However, I found a useful website, placehold.it, that auto generates a place holder image based on the input value. For example, http://placehold.it/200x200 will generate an image that is 200 x 200 pixels and also display the image dimensions on the image.
To use in HTML, you would use the following code: