Create a Photobucket account at www.photobucket.com. Photobucket is a free image-upload site.
Next, go to the tab that says "create slide show." Add your images to the slide show. Put images that are alike or that have similar colors together.
Make a note of the web address for your slide show. Photobucket will give you an HTML address, a direct link, address, and an email and IM address for your slide show to use in different situations, as well as an IMG code.
Test the slideshow to make sure it looks the way you want it to.
Now you have a handy portfolio that you can link to when someone asks you to email them samples of your work.