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If you aren't that much of an artsy person, a sticker would be the easiest way to go, however if you are an artsy person or you rly wanna do it yourself, go as mentioned, roughen the ski up a bit, remove all grease, and apply first layer of paint, then repeat depending on the paint you use 3-5 layers are great i think...
Then do whatever you want with your skis, i stenciled mine and its great, if you dont know where to start, check out the forums/tutorials on www.stencilrevolution.com...
(really dont, use crappy paint, youll end up having to paint more layers for the same result, and paying the same or even more money in the end...)
Then when youre done, i would finish it off with some layers of clear varnish so you wont ruin your piece of art on your first day of skiing...
Have fun, and dont rush it, you dont want to ruin your skis, take your time for it...