I don't think this is something that should be expected. You could use it as a selling point and build it into your costs. I think people would like it. I just did a candy buffet for my daughters birthday and my sister made a goodie bag for me because the homemade stuff was going fast and I didn't get to try the stuff I made!
Celtic knot work sounds beautiful!
Start browsing the most favorited cakes on this website, bride magazines, martha stewart weddings, Pinterest (yeah! I said it! Pinterest!!), fashion magazines, runway collections, scrapbooking supplies.
If cake pops are not an important part of your business, I wouldn't make them. To me, they're not quick or Simple. They're a pain in the butt. And the business you might drum up from this is going to be people looking for cheap cake pops.
I agree with previous posters: full price items that are the actual things you want to promote and sell in your business or free samples.