I used Card Sketch #17 to create this card.
And I used the following Stampin' Up! products: Mint Macaron Ink Pad, Mint Macaron DSP, Vellum, Pirouette Pink Ink Pad, and Pirouette Pink Cardstock.
For the sentiment on the front of the card and the small bicycle on the envelope I used a Stamp Set from The Stamps of Life.
Feel free to copy or use as inspiration!