These are nice chords, and I think they sound good when you play them as barre 
chords rather than open ones.

--Verse--  

  C           Dm 
A parcel arrived:

            Em                Dm
It was the gift that keeps giving.

  C          Dm
I opened it up.

             Em               Dm
and all the bells started ringing.

  C          Dm         
Gonna take you right back,

       Em          Dm
Right back to the begining

--Chorus--
       
       Bb              Dm      C
Of The gift that keeps givin again:

          Bb             Dm      C
It's the Gift that keeps giving again.


--Rest of Lyrics--

Well before I received,
This gift that keeps on giving.
I was always perceived as a loser,
That kept losing.
Well look at me now,
I'm a reciever that's reciving.
All these gifts that keeps giving again.
It's the gift that keeps giving again.

Giving the gift that keeps giving again.
It's the gift that keeps giving again.

Give it again, give it again, give it again.
Give it again, give it again.

Giving the gifts that keeps giving again.
It's the gift that keeps giving again.
It's the gift that keeps giving.
Recievers keep receiving.
It's the gift that keeps giving again


And that's basically it. Just repeat that chord structure for the rest of the 
song. This is a great song, a really nice song to play.