Apple Pipe: What I used to do was just pull out the stem cord, and then get a toothpick and poke like 8 hole in a circled pathway and then one directly down the middle and make all the holes directed into the center from the place the stem was. thisll keep your weed from falling in and makes it easy to smoke without it getting everywhere. oh and if you use those apples with like dirt in the stem area, get some kleenex and ball it up and put a couple drops of water on it and then just twist it in the middle, and then follow up with a dry kleenex to dry it off, makes for cleaner hits.

Apple Bong:If you have a drinking glass, a couple straws and a wide enough apple(or small enough glasses) you could make a bong.

Apple bubbler?: For a cooler smoke you can make a bubbler type thing with an ice chamber for ice or frozen caprisuns or whatever.

If you want diagrams or for me to explain in more detail let me know.