This A2 size card features the By the Bay Stamp Set from Stampin' Up! and was CASEd from one I saw online by Tina Zinck.

Link to My Stampin' Up! Store

For my version of this card I began by stamping the large scenic stamp from the By the Bay Stamp Set toward the bottom of a top mat of Whisper White CS (4-3/4" x 3-1/2") using Black Archival Ink (leave enough room to stamp your sentiment underneath).

Next I stamped the seagulls from the High Tide stamp set toward the top of the card using Memento Tuxedo Black ink.

Then I cut the top mat into 3 strips, the 2 outside strips are both 1-1/8" wide leaving the center strip at 1-1/4" wide.

I colored the center strip using Cajun Craze (siding), Old Olive & Always Artichoke (grass and bushes), Basic Black (roof), Basic Gray, Crumb Cake, Soft Suede and Early Espresso (pathways and rock walls) Stampin' Write markers.

I used a mask that I had stamped onto Post-it Tape and fussy cut it, to cover the scene, and then used Sponge Daubers to color the sky and water with Soft Sky, Island Indigo, and Blueberry Bushel inks.

Next I stamped the sentiment from the By the Bay Stamp Set (centered on the bottom of the piece) using Memento Tuxedo Black ink.

I attached the colored center strip using Tombow Glue to a piece of Soft Suede CS (1-1/2" by 3-1/2") - this left an 1/8" border on both side edges of the center piece.  
Then I attached the 2 uncolored strips onto a bottom mat  of Cajun Craze CS (5" x 3-3/4") leaving 1/8" border on each side and the top and bottom edges.  And then attached the center piece lining up the top and bottom edges.

The finished piece was attached to a bottom mat of Soft Suede CS (5-14" x 4") and then all attached to a standard A2 size White Card Base.