Do you ever think of using Zazzle.com when you are adding products to your lenses? You don't have to have products yourself. You can find Zazzle products from any gallery that fits the theme of your lens.
Zazzle.com is free to sign up. They pay up to 15% royalty on referral links. Squidoo has a Zazzle module, but it sometimes can give mixed results. Plus the module shows 3, 6 or 9 products, and I like to be specific with just one product that I really like and think fits the theme of the lens.