Three French Horns

And if one green bottle, should accidentally fall, there'd be four green bottles, hanging on the wall.

Five Rings For the Elven Kings Under The Sky

Six, six, the Lilly White Boys, Clothed All In Green, You Know.

Seven swans a swanning

Maids a milking. Almost Definitely.

Nine lords a leaping, no, hang on, we've had that

...Ten ladies dancing....

Eleven lords a leaping...

Twelve drummers drumming....