Can anyone recommend a whole song that a beginner can learn?

I started playing about a month ago. I know a lot of snippets of things, but I want to be able to sit down and play a whole song. If it helps at all, in terms of reference, I know the 5 main major and minor chords (E(m), A(m), D(m), G(7), C(7), D(7)) and am fine with strumming and some finger picking.

So, what's a song that's fairly easy to learn for a beginner?