[kyleburton]

Thanks, I appreciate hearing that. I had thought of putting an ad in the email, or even adding one to the bottom of the image itself - though I felt like that would be too intrusive and decided against it (adding to the image itself). Thanks for the feedback.

[resudne]

Unless you could find a solid impression based advertising provider or are willing to spend the time finding advertisers I wouldn't add anything to the image itself except (maybe) the URL to your homepage. For the email bit you'd still have to be careful with the TOS that most pay-per-click ad agencies have regarding email.