You can also roll chocolate balls in grated chocolate.
I have successfully made these with lemon cream biscuits with a squeeze of fresh lemon juice, but had to add a couple more biscuits to the food processor.
I have successfully made these with gingernut biscuits with a little chopped crystallised ginger rolled in coconut.
You can use TimTams but my suggestion would be to leave the balls over night as the Timtams are a slightly harder biscuit.
It seems that as long as you have your basic cream cheese and cream biscuit weights you can do the flavours you like.
I've also found these freeze well so can be made in advance or so that you don't eat them all at once.