I was told by many people (after my disastrous attempt at one) that the stripes needed to be wavy and basically how you want. They said that there wasn't a template, but that everything was free-handed.
I'd say take a look at mine, but please don't because it ain't pretty. 
Hope this helps a little bit.
I don't think that you need a template. Just cut the stripes free-hand with a pizza cutter or exacto knife. There's a good video on u-tube on how to make & apply zebra stripes to a cake. I just made a cake with stripes if you want to take a look @ my photos.
I saw on Cake Boss the other day that they lay the stripes on fondant and then it looked like they rolled them into the fondant and cut as needed or in other words lay them on your white fondant after rolled out and then roll the black stripes in the white fondant and cover your cake. I HAVE NEVER TRIED THIS so I dont know how ezasy it will be but it sure looked cool when they put it on the cake. HTH
I have not tried zebra stripes yet, but I will be soon. I'm planning on making them the way Donnagardner described... roll out the white fondant, cut some black fondant stripes free-handed, place them on the white fondant, and press them into the white fondant with your roller. That's how I did my Union Jack flags (in my pics)... you have to start with them a little smaller than you want them to end up being because they spread out slightly when they're rolled into the white base... learned that the hard way 
just google zebra stripes under images and there are different patterns 
When I do zebra strips on a cake. I roll out my fondant and use a pizza cutter to make the strips. The great thing about zebra strips is no one strip is the same. I thought that I had a pic of a zebra cake I did but I guess I dont. Will have to take a pic of one the next time I do one at work. They are really easy and alot of fun.
Sleeper713 please post a pic when you make one. I am very interested to see how this looks.
I basically cut strips in different shapes and sizes with an exacto knife and apply it to the cake. Below is the one I made, I also added sugar to the stripes.
http://cakecentral.com/modules.php?name=gallery&file=displayimage&pid=1350588
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