#1 Don't forget coordinating paper. I have seen beautiful work in Calypso & Pool Party (above) and Daffodil Delight and Real Red (below)
#2 Always remember Whisper White card stock! This is what you will be stamping on the majority of the time.
#3 Look to embellishments. The first card uses a paper punch to add a shape to the Whisper White; the Daffodil delight uses the ribbon for that flair. Check out the Happiness is Supplies tabs for more ideas!
The second thing on my mind is that my first solo demonstrator party is tomorrow! I'm looking forward to it. We'll be using Betsy's Blossoms & Easy Events 'Happy Birthday'. I'll let you know how it goes!