Here's a gorgeous creation using a combination of papers from Paper Temptress and an image from Sweet Pea stamps. This Charmaine Flannery image is called Elphaba and her Monkey. My coloring is very different from the artist's original, so be sure and check it out to see a different variation. The variety of papers I am using here are from Paper Temptress.
The base of the card is a gorgeous Mica cardstock called Ruby. It's a very deep red, almost purple looking color. The die cut layer is a gorgeous green Heavyweight Cardstock called Citron. THe top cardstock with die cut edges is a lightweight specialty paper from Hambly Studio Screenprints. It's a tiny piece of a paper called Out on a Limb. Isn't this a great way to use that extra paper that doesn't have the image on it. I just love the shimmery black with the silver accents.
Here's a wonderful close up of the image itself from Sweet Pea stamps. Below I am showing a close up of the gorgeous papers as well as some translucent flowers. I used some cute polka dot buttons on them as well as a flower rose. I also added some green pearls as highlights.
This card opens normally, and will fit perfectly into those 5.5" square envelopes. So it's just great as a slight variation on general A2 sized cards. I hope you have some great ideas now.