I need to do a Lilly Pulitzer inspired cake.  I am going to do the buttercream watercolor technique.  The dominant color is turquoise with some pink and white.  Should I start out with a white frosted cake and add turquoise and pink or should i start with a turquoise frosted cake and add white and pink?  I have never done this technique and do not really know how the colors will blend.

I'd start with a white cake - you can always add more colour where you want it but it's a lot harder to take it away by trying to add more white. But that's just me. I guess it depends on how deep you want the end colours to be.  :)

Thanks so much, I don't know if I made myself completely clear....when I said watercolor technique I am talking about adding more frosting color and smoothing that into the cake not actually painting on the cake.  Would your answer still be the same?  Thanks again sooooo much!

I've done this technique for my own cake and started with a white cake, then dabbed on teal, pink, and purple randomly, then smoothed it out. I added more teal and purple where I needed it, and some of the white still came through. I loved it when it was done. Simple, yet effective lol

Yep, same answer - white cake   

You made yourself clear, don't worry   

I start with a white cake that I've frosted and made pretty much smooth, not perfectly smooth, but heading that way. Then I add my colour(s) in little dabs and smooth that in and then just keep repeating that process until I'm happy with how it's looking.

Might be nice to start off with a very very pale shade of turquoise and then add a darker shade as well as pink and white. That would look very pretty too.

I'd probably then add some gold or silver too for a bit of glitz  

Thank you to everyone, so helpful!!!