I've seen where some of you add pudding mixes to your cake mixes....can you tell me what you add to a yellow cake mix and is it only 1 box per cake mix? Is it one xtra egg as well? TIA

I always add a small box of instant pudding and an extra egg to each mix.

I add instant pudding and an extra egg, and it makes a really moist cake. I also like the white almond sour cream cake recipe that I got off of here and I add pudding to it, and it is really good.

There is a post going around about adding flavored liquid coffee creamer in place of the water. Sounds yummy! I'm trying French Vanilla in DH white cake tomorrow and I added Caramel Hazelnut Swirl to Buttercream Dream icing yesterday and it was soooo good!

Here's another thread on enhancing, extending & doctoring cake mixes with add-in's like pudding, Dream Whip & meringue powder
(Has a lot of recipes.):

http://forum.cakecentral.com/cake-decorating-ftopict-292043-.html

Flavoring cake mix & frosting with coffee creamers:
(Mostly suggestions, some recipes.)

http://forum.cakecentral.com/cake-decorating-ftopict-285473-.html

HTH