Why the TARDIS is blue:
It stood in the great time war:

The poem is about the sadness of the doctor and how he carries on going strong.
He has had many companions and saw many things "Because he has lived a long life. He walked away from the last Great Time War. He marked the passing of the Time Lords. He saw the birth of the universe and he watched as time ran out, moment by moment, until nothing remained - no time, no space, just him! He walked in universes where the laws of physics were devised by the mind of a mad man. And he's watched universes freeze, and creation burn — he has seen things you wouldn't believe and he has lost things you will never understand — and he know things. Secrets that must never be told. Knowledge that must never be spoken! Knowledge that will make parasite gods blaze!

Rose went away

So the Doctor is blue.

Ask Donna, "Where's the Doctor?"

She'll reply, "Doctor Who?"

Sarah Jane, and Martha,

And now both the Ponds

Had their fun with the Doctor

And now they've all gone.

So ask me again

Why the TARDIS is blue:

There's a sad man inside

With both hearts torn in two.

It stood proud in the time war
Blast Daleks to smithereens
it's bigger on the inside
and can bring his companions on the TARDIS scanner screen!
"Who's is this?" Donna asked
"It's a Friends!" the doctor passed.

The doctor stood with rose on bad wolf bay
for it to be the end of a terrible day!
"I...I love you!" Rose cried.
"And I suppose if its my last chance to say it,
Rose Tyler…"

Some will leave and some will die.
At the end of the universe

on the fields of Trenzalore
The doctor stands over all the graves and cries.

But at the end of the day,
he carries on strong
Back to the TARDIS
To see his wife professor River Song
she'll hold him in her arms.
Comfort whilst he weep
He'll leave that old blue box
He'll be the one the universe tries to defeat!

I look upon my self, and reflect to doctor who,
I have lots of TARDIS models, which are all blue
Am I blue my self?

Down in the dump, do I need a time machine to come and visit you?

I'll carry a sonic, I must admit.
It's a comfort think, I think the show is a hit!

He has two hearts

Which both can break.

If sure if humans had the same

Tears will fill a lake!

Friendship dies and true love lies

Night will fall and the dark will rise

When a good man goes to war

Demons run, but count the cost

The battle's won, but the child is lost."