In my poem 'The Nasty Box' below, I have maintained Wright's structure, whilst changing the nature of the box.
The Nasty Box
I will
put in the box
the
bark of a dog, keeping me awake at night,
lava
from the mouth of an angry volcano
the
graze on my knee from when I fell over.
I will
put in the box
a
snowball filled with bits of dirt,
a fizzy
drink that’s gone warm and flat,
a
stomach ache and a trip to the doctor.
I will
put in my box
the
deafening taunts of a thousand bullies,
a
snarling teacher with sharpened fangs,
the red
crosses on my failed homework.
My box
is fashioned from decaying bark
with
fungus on the lid and ants in the corner.
Its
hinges are the knuckles terrible ogres.
I shall
bury my box
deep in
the bowels of a dense forest
where,
like a lost tribe,
it will never be
discovered.
As ever, I'd start by getting children to write a list of bad things, perhaps memories, people they find annoying, or things they find ugly, distasteful or scary. I would then introduce Wright's poem, and compare it with my own above, before letting the children loose on their own pieces.
Please note that there are many famous poems that can be subverted in this way. Another great example could be Adrian Henri's poem 'Love Is'. Why not get children to write a poem called 'Hate Is'. I personally find the latter much more fun!