as its woollen you could always sponser a sheep at your local zoo - I did that for a welsh friend of mine. He got a little plaque and all that showing that he was sponsoring Edgar the Sheep!! Funny tho - he stopped coming round sooon after that!!
Hey n00dles. I didn't know that. Thanks for that useless fact! hahaha!
How about one of those big mono-slippers? They're made out of wool aren't they? Or knit them a scarf with the words "In love for 7 years" knitted through it.
I quite like N00dles idea of a copper in a jumper!! Or you could report them to the local coppers on their anniversary by saying that they run a drug den from their house so that they get raided. I'm sure they'd find that funny.