There is a wedding website that has Plantable Card Favors. You may be able to reword them into birthday invites. I wasn't sure what you ment by eco-frendly seeded invites. Go to www.theknot.com and search Plantable Card Favors or go to http://weddingshop.theknot.com/plantable-card-favors.aspx?MsdVisit=1
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