Most projects come with how-to instructions or templates. While some are a little hard to imagine doing in multiple (hand-cutting 100 intricate paper cutouts with an exacto blade, anyone?), others like this birdie card (which basically just entails xeroxing clipart and embellishing with a little 3-D missive) are simple and sweet.
Remember doing linoleum block prints in grade school? It's simple and great for multiples. Happy crafting!