Here is the easiest version of INK by Coldplay i think.
Especially for those who'd like to sing while playing guitar.
I made this tab myself.

Use your CAPO on the 4th fret!

INTRO: 
G D/F# A Bm
G D/F# Bm A

VERSE:
G        D/F#                 A              Bm    G  D/F#  Bm  A
 Got a tattoo said to said 'together through life'
G          D/F#              A      Bm    G  D/F#  Bm  A
 Carved in your name with my pocket knife
G                 D/F#                   A    Bm    G  D/F#  Bm  A
 And you wonder when you wake up will it be alright
G           D/F#              A        Bm   G  D/F#  Bm  A
 Feels like there's something broken inside

CHORUS:
          G            A              D                     G
All I know – All I know – Is that I’m lost – Whenever you go
          G                       A                     
All I know – Is that I love you so – So much that it hurts

Back to INTRO

VERSE2:
G        D/F#         A        Bm    G  D/F#  Bm  A
 Got a tattoo and the pain’s alright
G           D/F#       A        Bm     G  D/F#  Bm  A
 Just want a way of keeping you inside

REFF 2:
          G            A              D                       G
All I know – All I know – Is that I’m lost – In your fire below
          G                       A                     
All I know – Is that I love you so – So much that it hurts

BRIDGE:
D            A             G                  D/F#            A
 I see the road begin to climb – I see your stars begin to shine
D            A               G                       G
 I see your colours and I’m dying of thirst – All I know
                     A
Is that I love you so – So much that it hurts

OUTRO (Repeat 4 times):
G D/F# A Bm
G D/F# Bm A