Try these for fun warm ups:

Sing scales and arpeggios to “ho, ho, ho”

Sing “roasting chestnuts” on a single note up and down the scale

Sing a descending scale to “dinga, dinga”

Sing “jingle, jingle” on a single note to a 5 note ascending scale

Sing “pring, pring” to a descending scale

 

Christmas tongue twisters:

twirling tinsel round the tree

red nosed Rudolph running round

I spy mince pies