From The Heart is a public FB page, which provides names and mailing addresses of elderly people who could use some birthday cheer, "thinking of you" cards, people in nursing homes, etc.
If you like sending cards, take a look; the page is public, so you should be able to view it without having a FB account; let me know if that's not the case and I can repost some of the info to my LJ.
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This FB page provides free printable stationery designs, take a look:
Free Penpal Stationery There are some very cute designs, holiday and otherwise; I'd saved some to my files. Again, you should be able to view it without having a FB account.