Happy Birthday Postcards from you Europeans!

Nice idea but.....

Getting the postcards to you in time would be hard work, and you'd have to give out an address and other personal details.
How about setting up an email account for the project, and getting people to send their messages to that?
You could print them at a photo shop (You'll get far better quality that way), and send them on to him.

All we'd need is your dad's first name.

fred by peb1962, on Flickr

Got to agree with fred, through this way lots people can send their wishes to Natalie's dad.
Including me 

It wouldn't be hard work. You just have to find a postcard of your country/something to do with your country, then I will give you my address. You would write the postcard to my dad, Neil, then put that in an envelope and write my address on the envelope, that's it. I will then send all of them in one batch to my dad. I've had many messages from others who would like to do it.