We generally use CRY or HelpAge India cards. This ensures help to these social communities as well, and it's good to give away such cards to employees. They are economical as well.
If you wish to send e-cards only, you can visit various websites like Yahoo, Hallmark, Santabanta, etc. From there, you can pick up the templates and edit them as per the need.
Hope this helps.
Regards,
Bhavna
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