Looking for some examples on what this entails. I know the melted ice cream and extra agg trick, what else is out there? Thanks 
Oh, I'm so glad you asked....heh, heh, heh.
Really, here's a thread that contains multiple links with info on just about anything, anyone has ever thought to add to cake mix.
(Includes all the extender and enhancer recipes.)
http://forum.cakecentral.com/cake-decorating-ftopicp-2047091-.html
HTH
I used the extender recipe with 1 c flour, 1 c sugar, 1 egg and the rest of what it calls for, plus half a small box of pudding-
OMG!!!!!!!! It was beyond deliscious! I used the pudding mousse recipe in between- let's just say- it did not even need the yummy BC icing- I could have eaten the whole cake with just the filling-
that is the best recipe ever!!!!!!
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