What about something about ...ahem...adult toys?
Hope Santa brings you a new toy, heard the old one burned up from overuse
Hope Santa brings you a new toy that makes you go 'Oh, oh, Ohhhhhh'
...or something along that line.
Heard you were on the naughty list...wanna come to my house and play?
Here are a couple cards from my blog:
Jane's Creative Process: Bah Humbug
Jane's Creative Process: Naughty Snowmen!