Be careful: most Creative Commons images require attribution, meaning you need to give credit to the artist in order to use the image. Make sure you understand Creative Commons and other licenses 3 Popular Image Licenses You Need To Be Familiar With Before Using Someone's Photos 3 Popular Image Licenses You Need To Be Familiar With Before Using Someone's Photos Read More before using such images.
My colleague Chris compared Google Image search to Bing Bing Images vs. Google Images - Which Has Better Results? Bing Images vs. Google Images - Which Has Better Results? Bing’s image search once challenged Google, offering more features and a better design. With infinite scrolling and the ability to search for similar images, Bing was legitimately better than Google at image search just a... Read More , and found Google’s results to be better. If you feel the same way, don’t worry: you can use it to find rights-cleared images. While searching for an image, click Search Tools then Usage Rights.
If you mean your own artwork, then you'd take a picture of it, upload it to your computer (make sure you know where you're saving it), then select Insert > Picture in Word, browse in the location where you saved the photo, click the picture, and insert. If you mean an image from the internet or something, you can just save it to your computer and basically follow the rest of the steps above.
If clip art appeals to you for its retro feel, you might also like pixel art. You can create some yourself with pixel art tools The 11 Best Pixel Art Tools to Create Pixel Perfect Artwork The 11 Best Pixel Art Tools to Create Pixel Perfect Artwork Do you want to try your hand at creating pixel perfect artwork? These pixel art tools will help you get started. Read More .