Here is one that I have used off the box of Duncan Hines Classic Yellow cake. I think you can do it with other flavors as well.
1 Packsge Duncan Hines Yellow Cake mix
1 4 oz box vanilla instant pudding/pie filling(or you could probably use whatever you want)
1 cup water
1/3 cup oil
Mix together and bake.
I think this makes a good moist dense cake...but not as firm as pound cake. It stacks well and you can easily cover it with fondant. You might try it on a practice cake to see what you think. Good luck! Let us know which recipe you end up using!