I have watched so many talented crafters make window cards and Hero Arts has this technique as part of their September contest, so I could not resist and had to make one myself.
Paper: HA Notecard; Neenah
Ink: Memento; Derwent Colorsoft pencil crayons; Fired Brick DI
Stamps: Hero Arts (Hydrangea K5376; Flourish Background CG119; sentiment CL488)
Other: bow (old stash)
The Hydrangea is coloured in with some Derwent pencil crayons. I stamped the Flourish Background stamp with Fired Brick distress ink on the front of the notecard and then cut out the window.