To put it simply: Wood, PVC, a metal rod, and some sand.
There are a ton of guides that basically explain what I did, but in case anyone is interested in exactly how I did, I guess it never hurts to have too many how-to's:
Measured the LxW dimensions of my speakers (9"x9"). Then I went to Lowe's and bought like 6'x12"x1" (6 foot plank. 1" thick, 12" wide. Some people who made other how-to guides had 2" thickness). When I got home I cut two pieces of wood that were just slightly (1/4" maybe?) bigger for the tops. Then I cut two 11"x11" pieces for the bases.
I sanded the wood and then stained it with ebony wood stain. I did two coats and then sealed it with two coats of polyurethane to protect the wood and give it a nicer finish. (Sand in between your polyurethane coats!)
I bought a 5' tube of 3" PVC and cut it in half. I primed the PVC tube and then spray painted it with truck bed liner paint. It wasn't my first choice of paint, but I am actually stunned at how well it turned out. It has a very nice texture.
I decided to use a 3/8" all-thread rod to connect the top and bottom pieces of wood. I drilled a 3/8" hole in the center of the top piece and the center of the bottom piece. You would also need to drill a hole about halfway through the wood with a paddle bit so that you can fit your washers/nuts properly. A quick Google search shows an example of what I'm talking about here:
After my PVC and wood was dry and ready to be assembled, I grabbed some heavy duty construction caulk (the kind that bonds any material to any material; in this case, wood to PVC) and put it on the bottoms of my PVC pipes that were going to go against the wood base. This was hands down the hardest part. Trying to get the PVC on your base dead-center without getting caulk all over the place was a pain in the ass. Just be patient, and at least if you used ebony, it's easy to cover your mistakes It was important for me to have a good seal between the PVC and the wood, because I chose to pour a bunch of playground sand ($3 for 50 pounds at a hardware store) down the PVC tube for added weight/stability.
When I had my PVC base centered and it was finally sealed to the wood, I ran the rod from the bottom of the base (the one thats on the floor!) up through the PVC. I noticed that I needed to cut the rod so that it would lay flush against the very top of my top piece of wood. I wouldn't want to have 1/2" of a steel rod poking out the top of my speaker stand. I used a band saw to cut it. (My old man owns an equipment rental store, so I had pretty easy access to some of these otherwise hard-to-acquire things like saws and what not).
When the rod was cut to where I needed it to be, I added the sand. It's very important that the rod was in place where it needed to be because once you start pouring sand, it would just be a fucking *mess* to try to run it through. I used a cup to pour the sand in about 90% of the way to the top. I held the rod center as I did that.
Last stop was putting the top piece of wood on, centering it with the bottom, and then putting the top washer/nut on and tightening. After everything was secure, I just used some of that kitchen drawer rubber-lining and cut it to size to put under my speaker for added grip.
And I realize that maybe this wasn't the right place for this post, and I really did not mean for it to be so long. Aye, aye, aye. Hopefully it helps someone if they need it.