American Greetings' website has an amazing assortment of printable activities. Most are only available to members of its Create & Print Membership, but there are many free ones! They have printable Greeting Cards, but the cool stuff is all the other crazy printables, including:

• Announcements
• Bags
• Bottle Huggers
• Brochures & Flyers
• Business Cards
• Buttons
• Calendars
• Candy Bar Wrappers
• Coloring Sheets
• Craft Cards
• Envelopes
• Fax Cover Sheets
• Games
• Garlands
• Invitations
• Labels
• Moneyholders
• Newsletters
• Party Sets
• Placecards
• Postcards
• Stationery
• Wineglass Tags

You can browse the printables by Holiday or by type of project. The free ones are always at the top, if there are any. If you end up liking the membership printables more than the free ones, the Create & Print membership is $19.99 for a year. And you can try it out for a month for free. Some really cool printables here.