3. A method as recited in claim 1 , wherein identifying the one or more clipart images comprises: determining whether individual images of the plurality of images include a simple background or a complex background; and identifying one or more images of the plurality of images as the one or more clipart images in response to determining that the one or images include the simple background.
3. A method as recited in claim 1 , wherein identifying the one or more clipart images comprises: determining whether individual images of the plurality of images include a simple background or a complex background; and identifying one or more images of the plurality of images as the one or more clipart images in response to determining that the one or images include the simple background. 4. A method as recited in claim 3 , wherein determining whether each image of the plurality of images includes the simple background or the complex background comprises: determining a dominant color for each corner region of each image of the plurality of images; determining a number of corner regions of each image that share the dominant color; determining that a particular image of the plurality of images has the simple background in response to determining that the number of corner regions of the particular image that share the dominant color satisfies a predetermined threshold; and determining that the particular image has the complex background in response to determining that the number of corner regions of the particular image that share the dominant color does not satisfy the predetermined threshold.