GALLANT GREETINGS
http://www.gallantgreetings.com/contact.cfm
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Gallant offers a full selection of cards to cover a wide range of sending situations with the freshest styles and most popular designs, which is just what your customers want in their greeting cards. They have Our Traditional Line, On the Cutting Edge (alternative humor), WoodWinds (very photographic), Inspirational Thoughts (traditional values through religious and inspirational verse), Estrella (Spanish) and Packaged Goods (invitations, announcements, thank-you notes).
NOTE: Contact them via email and ask if they have detailed guidelines or are not accepting queries for any particular lines. Be professional and state you have some ideas you'd love to pitch. Be patient. They'll contact you back.