You won't need to comb the beaches trying to dig up guests when you create your own seashell wedding invitations. You can create the following invitation in one of two ways:

Using The Computer:
Here are the basic instructions on how to create this seashell wedding invitation using a computer graphics program.
Because of the large variety of such software programs available, it is beyond the scope of this site to get into instructions on how to set up your image and print it out properly. Please refer to the directions that came with your software program.
1) First, using a graphics program set your image size for 4" x 6" or 5" x 7" (or whatever size you wish your invitation to be).
2) Then cut and paste a seashell background onto one side measuring no larger than 1 1/2" to 2" wide, depending on the card size you've chosen (or you can paste in individual seashell graphics along the side border instead).
3) Center your text wording in the remaining white space. Save and print.
Making Your Seashell Wedding Invitations By Hand
Do you enjoy making homemade cards? If so, you can create this invitation using scrapbook papers and printed graphics or stickers. Here's how.
1) Choose a white heavy paper stock as your background and cut it to size you want your invitation to be.
2) Cut a border 1 1/2" to 2" wide of seashells from scrapbook paper or from a photocopied photograph of seashells. Glue the border to the left side of the stock paper.
3) Carefully hand write your invitation or print it up on your computer with a word processor then run the invitation through to print. This may take a bit of tweaking to get your wording exactly where you want it on your invitation, so I would suggest trying this out on cheap paper first that's been cut to invitation size and just draw a penciled-in outline of where your picture will be located on the cardstock.
You could then get your seashell wedding invitations copied at a photocopy center or scan it into your computer and print off invitations on good quality white paper using a color printer. A photocopy center will also print invitations for you... just bring in your image on a memory card or burned CD.
Here are a few other things you can do to embellish your invitation: