Are you making classic Chocolate and vanilla? If not. I saw on one site where they took a cake mix and made the two different flavors by disolving one to two tablespoons of jello in some of the water added to the cake mix( they put it in hot water and let it cool). Then you get it the two different colors also. I recently went to a wedding show and one of the decorators featured raspberry and Lemon, really yummy combo. 
babynewyear
I did read that somewhere about the chocolate needing to be heavier...
I hadn't though about doing classic choc/vanilla! I always thought there was some super secret recipe. DUH! Again, i have never even had marble cake so I'm clueless on this one...
Do you just put down the chocolate and then glob on the vanilla in a random pattern?
Usually you just add cocoa to a portion of the batter. Mine is always the same consistency. There must be a million marble cake recipes. Any book or on the internet. What about a mix?
Since there is more vanilla batter you pour that in the pan, then glob spoonfuls of chocolate batter on the top, then take a knife or whatever and pull it through the whole cake.
Does that make sense?
Ive always just blobed the chocolate into the vanilla then swirled it with a knife. Just dont overmix. 
Usually you just add cocoa to a portion of the batter. Mine is always the same consistency. There must be a million marble cake recipes. Any book or on the internet. What about a mix?
Since there is more vanilla batter you pour that in the pan, then glob spoonfuls of chocolate batter on the top, then take a knife or whatever and pull it through the whole cake.
Does that make sense?
Great minds think alike mudpie I just saw your post after I submited 
babynewyear
I always use DH marble cake mix - and it's great! I've tried adding cocoa to white, came out a little dry. I've also mixed my chocolate w/ strawberry, for marble, it was good... But I keep going back to DH. Very moist!
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