If you have a manual die-cut machine such as the Cuttlebug or the Sizzix Big Kick, you can use embossing folders to create simple but elegant cards. Here is a bridal shower card I made last month for my cousin's fiancé. The size of the card is a standard A2. I used my Sizzix Big Kick along with the multi-purpose platform set at Tab 1 as well as a pair of cutting pads. For the embossing, I chose the Cuttlebug D'Vine Swirls A2 embossing folder. All you need to do is place the paper within the folder, sandwich the folder between the two plates and place on it on the platform. Insert into the Big Kick and rotate the handle to emboss. It's quite simple and I love adding texture to otherwise plain card stock.
To make it pop and give it a bit of an antique feel, I took a pad of white ink and lightly rubbed it against the raised surface. Then I added a flower using a flower brad to some pink polka dot ribbon from Michael's and taped the ends of the ribbon on the back of the brown embossed card stock. The sentiment is from Stampin' Up and the adhesive gems are from the dollar store.
So there you have it. A card that is fairly simple to make yet elegant and unique!