Okay, a new idea pops up, you just gotta be the first to get it posted on OSP! Check this out:

http://www.zazzle.com/stamps/

You can create postage stamps with your own pictures on them... perhaps that would be a useful then to offer as an option to clients... shoot their engagement portraits, they could use them on their wedding invitations. Or a wedding shot for the thank you notes. Who knows, but I like the option :-)

They do a lot of other customized low run stuff as well, might be worth a look.

--Dan Dawson

I think the USPS does this too... I looked into it last year when I designed wedding invites for someone. I think it's a cool idea, just not cost-effective if they're on a budget!