Adding texture to cards will always enhance them by adding dimension and creating interest.
The easiest way to do this is with the use of embossing folders and the new 5x7 Textiles range from Crafter's Companion is just perfect. They are being showcased on Create and Craft TV this weekend at an amazing price, so well worth a look.
I made a few samples for the shows. The first two incorporate a mixture of two folders, Hessian and Distress. The baby card is inked lightly with brown ink. The Cherish card is inked with gold ink and heat embossed