A simple technique to do using the roller wheels is a shadow technique, also sometimes called a 3D technique. Basically it involves rolling the wheel across the card stock using a dark ink, but make sure you know where the seam in the roller wheel rubber is prior to doing this. Then clean, rein your roller wheel in a lighter colour and lining the rubber seam of the roller wheel up again, this time about 2-3mm offset from the first roll, roll across the card stock again.
I would like to note – it was my photography that was crooked here not the card!
Stamps: Fabulous Foliate
Card Stock: Pool Party, Midnight Muse, Whisper White
Ink: Midnight Muse, Whisper White Craft
Accessories: Paper piercer, mat pack, 1″ circle punch, 1 3/8″ circle punch, 1 1/4″ circle punch, Dimensionals.