As well as making your web page look more interesting, images can serve a useful purpose for your search engine optimisation.
Make sure that your images are appropriately named (e.g. red-widget.gif), and ensure that they have descriptive title attributes and alt attributes to describe what the image is about, and what it looks like.
Search engines will use this information as a better indication of what the page itself is all about, and will quite often index the images themselves so that they appear when people search for images of things, helping to boost your traffic even further.
Read our article about the importance of images in blog posts.