Hey and welcome to CC. First of all I just uploaded a picture of a cake I just finished yesterday that is both giraffe and zebra print.
http://www.cakecentral.com/cake-photo_1563819.html
Basically once your cake is covered, you just roll out your stripe color and randomly cut different shaped stripes. If you look at a photo of a design on here that you like, you can copy the stripe idea for size and shape.
It's fairly easy especially if you have like a pizza cutter to cut your stripes out.
Theres alot of different ways on here in the photos.
Good luck