The Disney store on-line has some personalized tees that have Mickey and Minnie in wedding attire...we ordered them and they are okay (totally cute, but the quality is a bit less than expected).
One of the "new" personalized tee selections on Disneyshopping.com directs you to zazzle's site...I think the possibilities there are endless.
There is also a sticky on the "Theme Parks" board about folks who have designed and made their own t-shirts...and some of the designs are INCREDIBLE. There is a girl on there who will make custom designs and then you can just print them on iron-on transfer paper (from your printer) and make some yourself. You can try to PM the girl there to see what she has or can do...
Of course, if you know someone going to Disney, there are options once you get there (for example, there is a store in MGM that does embroidery on t-shirts)...
Just as an fyi, the t-shirts from www.Disneyshopping.com where you can make the bride & groom shirts, are on sale $9.99!!! No better time to get them!!!
that zazzle site is awesome!!! thanks!!! might order stamps, tshirt and invites from them
wish they can do custom RSVP cards though...that's what we like to get. anyone have good place to custom make and order in small quantity?
Wow I like the zazzle.com website to order shirts, It is pretty neat,you can choose whatever character you want and the color of the wording and everything else. How Cool.