I have a piano arrangement MIDI laying around of Flip, Flap and Fly that I made years ago, if anyone wants it (in MIDI, MP3 or sheet music format). It's a fairly difficult arrangement but it's definitely playable!
[EDIT]: I forgot; I have two piano arrangements for "Adventuring", as well:
One which is pure accompaniment, intended to be sung along with and one which has the melody of the song integrated into the arrangement.
I seem to have two for "Always There", as well: One with the melody and one with both hands as accompaniment, intended to be sung along with. It looks like I didn't quite finish the "melody" one, but it's about 75% done. I'm sure you can kind of figure out the rest.

I have the piano *accompaniment* parts for Bestest Friends and No One Has To Be Alone as well, but they won't have the melodic parts in them; just the piano accompaniment, intended to be sung along to. I can post up the melody scores but they won't be integrated properly with any other parts; it would just be the melodies.