This is my principle for a sunburn.
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Description:
This machine adds something new
to survival: You can't stay too long
in the sun. You will start taking damage
if you stay too long in the sun. 
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Indication:
You  can see your Sun time in the 
sidebar.
Your sun score will increase while
you are in the sun. When the score
hits 120 your will start taking damage.
Your sun score will decrease if there
are blocks above you.
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Why this?:
This is an random idea I came up with
while watching YouTube videos.
This is just something I made for fun.
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Usage:
You can import this in your world
to play survival.
You can also use this for your
own map. I would like a credit, though.