Once again, I had nothing to do (and i'm supposed to be a college student) so I made these. not to say that the other tongs instructable's a bad one, but I think these are easier to do. They're not better, just different. (I don't have a plasma cutter, for one) You'll need:
1: A piece of MILD steel big enough to make the tongs. I used some 20mm wide by 4mm thick by 1 meter long, giving me tongs about 50 cm long when I'm done.
2: You'll need a metal vise sturdy enough to stand all the bending that's going to be happening, 2 pairs of heavy-ish metal pliers, a hacksaw, for cutting the metal
3: You'll also need a blowtorch capable of heating this much steel into its plastic state (A fairly bright red colour) and the relevant protective gear. A drill and a bolt, to make the hole and hold them together are also pretty important.

Step 1: Cut the Steel Bar to Shape

Cut the steel bar to the length you want the tongs to be. Longer tongs are harder to use. I had 1 metre of steel, so i just cut it in half. Now the important cut: 5cm from the end of each bar, cut halfway through the steel. This will make the bend that forms the jaws of the tongs tighter. The bars in the picture haven't had the second cut made yet.

Step 2: Bend the Steel

This is the bit you need to pay attention to. Heat the steel at the bottom of the cut you made to a medium to bright red heat. The closer you get the steel to red, the less chance it has of getting stressed and snapping an potentially inconvenient moments. Once the steel's red, grab it in the pliers, and twist it in the vise. The vise should be open enough so that you can easily slip the metal in and out. Also, when you're bending, bend the newly-formed jaw of the tongs inwards slightly. This will help the tongs pick stuff up. I also cut off a piece of steel that was getting in the way. The pictures show what I mean best. REMEMBER: both sides of the tongs are the same, don't twist one bit of metal one way and another the other way. Twist the jaws the same way, otherwise your tongs will look stupid.

Step 3: Drill a Hole...

Now you have 2 identical pieces of metal, you need to join them together. Pinch them together with your fingers and find a point that feels comfortable for you. What I mean by that is: find the place you want them to rotate around. Depending on the size of the stuff you want to grab with these, you'll need to move it somplace. I don't need them to hold huge things, so i put it 8cm in from the end, about halfway up.

Step 4: ...And Add a Bolt

Once you've drilled your hole, you need to fix the two bits of metal together. Use a short bolt, slightly smaller than the hole you drilled to do this (i forgot to mention that i used a 3mm drill bit) Don't use those locking nuts, the ones with the nylon insert, because it'll just melt and smell. Use a normal nut. You should have something that looks like the picture. I also bent the bolt over, so it can't come undone when i'm doing something. Don't make them too tight. Metal expands when it heats up, so leave some dead space

Step 5: Bend the Handles

Once you've bolted them otgether, test to see how they close. Find the point where the handles split, that is: where one handle isn't above another handle anymore. Go back to the vise, and fire up the torch. Heat the area you selected to Red heat and bend it. Again: having the vise open enough to slip the metal in and out, but still close enough to grip the metal well is a good idea. Using your 2 pairs of pliers (one on each side of the metal, so you hold both sides) twist the metal through 90 degrees. Do this for both sides. Twisting the metal again makes better handles for the tongs, and reduces the chances of catching a bit of flesh in them. They should look like the ones in the picture when they're done.
Once everything's been bent, sawed, drilled and generally prodded, let them cool down (stuff doesn't have to be glowing to be hot). Once they're cool, test them. Try picking up things of different sizes. Try picking up the following things:
Keys, Pens, Watches, Padlocks, Files, DVD cases, Stuffed rats with LED eyes.
Dont try to pick up small relatives. They won't appreciate it.