I think it's a great idea. Might I suggest a few things though

a) Forget a blog unless you intend to really (and I mean really) commit to it. An outdated blog that is never updated is nothing more than an eye sore on a business site.

b) I think you're on the right track with having bridal shops help promote you, except I would suggest targetting wedding planners, photographers and banquet halls since they seem to have their finger on the pulse of weddings as well.

Having a selection of stock designs as well as the option for custom designs is an excellent idea.

If you're based in Canada or are interested in doing some business in the great white north let me know. I've got quite a network of people who work with weddings and may be interested in promoting/selling your products