Just something I cobbled together it doesn't all scan perfectly but I hope you enjoy!
On the 1st day of Christmas Harry gave to me a
Cloak of invisibility.
On the 2nd day of Christmas Harry gave to me
2 House Elves
And a cloak of invisibility
On the 3rd day of Christmas Harry gave to me
3 Pygmy Puffs
2 House Elves
And a cloak of invisibility.
On the 4th day of Christmas Harry gave to me
4 Horntails
3 Pygmy Puffs
2 House Elves
And a cloak of invisibility.
On the 5th day of Christmas Harry gave to me
5 Time turners
4 Horntails
3 Pygmy Puffs
2 House Elves
And a cloak of invisibility.
On the 6th day of Christmas Harry gave to me
6 Wands a-sparking
5 Time turners
4 Horntails
3 Pygmy Puffs
2 House Elves
And a cloak of invisibility.
On the 7th day of Christmas Harry gave to me
7 Quills a-scratching
6 Wands a-sparking
5 Time turners
4 Horntails
3 Pygmy Puffs
2 House Elves
And a cloak of invisibility.
On the 8th day of Christmas Harry gave to me
8 Owls a-swooping
7 Quills a-scratching
6 Wands a-sparking
5 Time turners
4 Horntails
3 Pygmy Puffs
2 House Elves
And a cloak of invisibility.
On the 9th day of Christmas Harry gave to me
9 Werewolves howling
8 Owls a-swooping
7 Quills a-scratching
6 Wands a-sparking
5 Time turners
4 Horntails
3 Pygmy Puffs
2 House Elves
And a cloak of invisibility.
On the 10th day of Christmas Harry gave to me
10 Ghost a-floating
9 Werewolves howling
8 Owls a-swooping
7 Quills a-scratching
6 Wands a-sparking
5 Time turners
4 Horntails
3 Pygmy Puffs
2 House Elves
And a cloak of invisibility.
On the 11th day of Christmas Harry gave to me
11 Hippogriffs bowing
10 Ghost a-floating
9 Werewolves howling
8 Owls a-swooping
7 Quills a-scratching
6 Wands a-sparking
5 Time turners
4 Horntails
3 Pygmy Puffs
2 House Elves
And a cloak of invisibility.
On the 12th day of Christmas Harry gave to me
12 Snitches flitting
11 Hippogriffs bowing
10 Ghost a-floating
9 Werewolves howling
8 Owls a-swooping
7 Quills a-scratching
6 Wands a-sparking
5 Time turners
4 Horntails
3 Pygmy Puffs
2 House Elves
And a cloak of invisibility.
Happy Christmas!!
On the 1st day of Christmas Harry gave to me a
Cloak of invisibility.
On the 2nd day of Christmas Harry gave to me
2 House Elves
And a cloak of invisibility
On the 3rd day of Christmas Harry gave to me
3 Pygmy Puffs
2 House Elves
And a cloak of invisibility.
On the 4th day of Christmas Harry gave to me
4 Horntails
3 Pygmy Puffs
2 House Elves
And a cloak of invisibility.
On the 5th day of Christmas Harry gave to me
5 Time turners
4 Horntails
3 Pygmy Puffs
2 House Elves
And a cloak of invisibility.
On the 6th day of Christmas Harry gave to me
6 Wands a-sparking
5 Time turners
4 Horntails
3 Pygmy Puffs
2 House Elves
And a cloak of invisibility.
On the 7th day of Christmas Harry gave to me
7 Quills a-scratching
6 Wands a-sparking
5 Time turners
4 Horntails
3 Pygmy Puffs
2 House Elves
And a cloak of invisibility.
On the 8th day of Christmas Harry gave to me
8 Owls a-swooping
7 Quills a-scratching
6 Wands a-sparking
5 Time turners
4 Horntails
3 Pygmy Puffs
2 House Elves
And a cloak of invisibility.
On the 9th day of Christmas Harry gave to me
9 Werewolves howling
8 Owls a-swooping
7 Quills a-scratching
6 Wands a-sparking
5 Time turners
4 Horntails
3 Pygmy Puffs
2 House Elves
And a cloak of invisibility.
On the 10th day of Christmas Harry gave to me
10 Ghost a-floating
9 Werewolves howling
8 Owls a-swooping
7 Quills a-scratching
6 Wands a-sparking
5 Time turners
4 Horntails
3 Pygmy Puffs
2 House Elves
And a cloak of invisibility.
On the 11th day of Christmas Harry gave to me
11 Hippogriffs bowing
10 Ghost a-floating
9 Werewolves howling
8 Owls a-swooping
7 Quills a-scratching
6 Wands a-sparking
5 Time turners
4 Horntails
3 Pygmy Puffs
2 House Elves
And a cloak of invisibility.
On the 12th day of Christmas Harry gave to me
12 Snitches flitting
11 Hippogriffs bowing
10 Ghost a-floating
9 Werewolves howling
8 Owls a-swooping
7 Quills a-scratching
6 Wands a-sparking
5 Time turners
4 Horntails
3 Pygmy Puffs
2 House Elves
And a cloak of invisibility.
Happy Christmas!!