I made my own pipe awhile back, my owns a construction bussiness so I have access to tools and wood. I took a small 2 x 4 then traced a simple spoon shape on it, cut out the spoon wth a jigsaw. Then I took a 1" butterfly dril bit and pressed it into the end of my spoon shape to make the bowl. Then I took a drill it and drilled a hole into the stem of my spoon sothe hole ended just underneath the center of my bowl. Then I a hand nail and nailed it down like 1/2 " into the center of the bowl so the stem hole and the bowl met. I pulled the nail out and I had a perfect 6 inch spoon pipe but all the edges were sharp and boxey from the jigsaw so I got a belt sander and sanded down the stem and the bowl so it was perfectly round. It looked amazing and I carved a pot leaf on the front of the spoon with my brothers wood burning kit and then I painted it white with a clear coat mixed with silver sparkles. It looked like somthing you could buy at the store but it took my like 3 hours to make and took a shitload of power tools.

Materials:
Jigsaw
Cordless Drill (with butterfly bit and reg. drill bit)
Hammer
Nail
Belt Sander (sand paper works but it would take you FOREVER)
Small 2x4
Paint/glitter/ect. for decoration.

This computer cant post pictures but when I go to my moms tonight at 6:30I will try and get a picture up.

P.S. Aluminum pipes suck wether they give off fumes or not, only use tinfoil when your desperate.