online invitation maker?!
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Are you wanting to email the invitations or print and mail them? If you want to create online invitations, the best site I know of is Evite.com. They recently updated the online invitation maker, and you can upload your own photo to use. Plus, they have a specific section for birthday milestones like Sweet 16; some are super cute. Check it out here: http://new.evite.com/#gallery/select_category:category=birthday_milestones&displayName=Birthday_Milestones
If you'd rather print and mail invitations, you still might be able to use Evite to design your cards and then print them from the website. I don't know how well that would work though - never tried it.
Hope that helps!
Personal experience and Evite.com