This is one of my favourite colour combos - well, today anyway! It's Not Quite Navy, Kiwi Kiss, Baja Breeze & Basic Grey.
I've used a One Sheet Wonder technique to do the stamping on Whisper White. This is by far, the best way of making a few cards at the same time with the minimum fuss.
Keeping the embellishments simple is another good tip - keeps the cost down too. In this case I've used Kiwi Kiss Striped Ribbon and a staple. Voila!