Using Bold Brights as the main colours.
Adding texture (ripped paper)
Using some DSP and ribbon. I love this colour combo the best.
Chocolate Chip, Pretty In Pink and Real Red
Using versamark on Kraft for the background.
The same card in different colour combos to show how you can use one design for both male/female cards.
I hope I have inspired you to have a play around with those stamps in your sets which you may not have used yet. You'll be surprised at how easy it is to incorporate them into your designs.