Birthday cake clipart images are available on Clker.com and CleanClipart.com. To download birthday cake clipart, navigate to Clker.com and enter "birthday cake" in the Search box at the top of the page. On the Search Results page, click the thumbnail of a birthday cake clipart.
Once on the chosen clipart page of Clker.com, select an image size by clicking the button of the size below the clipart image. When a new window appears with the clipart in the selected size, right-click on the image, and select Save Image As to download the clipart file.
To find images on CleanClipart.com, enter "birthday cake" in the Search text box at the top of the page. Click the thumbnail of a clipart image in the search results, and click the Download Clipart link below the clipart image to download the file.