For this card I covered the stamped flowers with a mask before stamping the leaves. Then the masking layer was removed and the leaves appear like they are behind the flowers.
You can see how the inside was finished below.
Here are the supplies I used:
Peaceful Petals stamp set
Price: $20.95 clear, $28.95 wood.
Crisp Cantaloupe 8-1/2" X 11" Cardstock #131298
Crisp Cantaloupe Classic Stampin' Pad #131176
Pear Pizzazz Classic Stampin' Pad #131180