If it's just for fun, apples seem pretty easy to grow from seed. I have one plant overwintering in my vegetable garden, one (hopefully) overwintering in a container outside, and two more that sprouted at the base of the Jalapeno plant that is spending the winter indoors.
Trouble with apples is that all the eating apples need to be cross pollinated to bear fruit, so the seedling apple is *wild* -- there's no way to tell what kind of fruits or what kind of tree characteristics the offspring will have. For that reason, and a few other reasons, apples are propagated by grafting a scion wood or bud to root stock.
I have most success with planting seeds from cold-stored apples (the seeds have already been cold-stratefied and are ready to germinate). I usually look up harvest time for the apple variety where it was harvested, and see how long they might have been stored. But this time of the year, most U.S. apples have been stored for 4 months or more, so any apple you eat, you should be able to plant seeds from and expect them to grow. I usually just stick them in with any container plant I have around.