I did a Strawberry Lemonade cake a few weeks ago. For all non-scratch people, this one's for you as it's super easy!!

Cake:
1 box Strawberry cake mix (made as directed)
Add one box on instant lemon pudding

Filling/Icing:
Wilton buttercream recipe with Lemon extract instead of Vanilla (I had to add a little more than the 1 tsp the original recipe calls for since the lemon extract was not real strong).

Everyone raved about it and it did taste like you were having a glass of Strawberry Lemonade

the arnold paulmer cake sounded wonderful, I am also going to try the strawberry lemonade one, great ideas ladies.
PS would love to have the arnold paulmer recipe

Arnold Palmer cake

Basically you replace the liquid in your recipe(box or scratch) with strong steeped black tea. I steep mine in my milk for my scratch recipe. I also add a little lemon extract.

For the lemonade icing, I put 2 of the Crystal Light single packets in my buttercream recipe along with some lemon extract. I also add a little of the unsweetened lemonade Kool Aid for the added tartness. I use american buttercream for this. The icing is nice and tart even though you have all the powdered sugar in there.

The people I work with always ask for this icing when I make a cake.

HTH
Robin

The strawberry lemonade sounds wonderful!

I don't see why not. Just make sure that you steep the tea for at least 1 hour. The milk doesn't make the flavor as strong as water does. I use half steeped in water and the other half in milk sometimes. Makes the flavor more intense.