Step 1: Here are the parts
1 x 200 point 21030 transparent breadboard
1 x Super ultra-bright LED (Red)
1 x Super bright LED (blue)
2 x 100 ohm resistors
1 x 2-pin header (optional)
1 x Breadboard Voltage Regulator Kit (optional - it's just a convenient 5V power supply)
(here's a bundle link for all the necessary parts)
Drill with 3/8" bit (5mm works better)
Step 2: Prepare the LEDs
We used a sanding belt to bring it down to size, but see how it leaves the top an opaque white? Here's a trick: Rub the flat face against a sheet of paper for a full minute. It brings up the polish quite well, and if the face is fairly smooth, you can almost get it back to stock clarity.
Step 3: Drill the hole
Step 4: Install the LED
Use a dab of hot-glue to hold the LED in the hole. If you used a 3/16" drill bit, it may be tight. You might have to redrill it out by wiggling the drill bit side-to-side to open up the hole diameter a bit.
NOTE: If and when you do the LED on the other side, the polarities will reverse because you will be approaching the power rails from the other end. Make sure you keep your anode (+) and cathode (-) / red / blue rails sorted out!
Step 5: Add the 100 ohm Resistor
Clip off one resistor lead so you have about 3/8" of an inch (5mm) and bend it 90 degrees down. Stick this end into the last hole of the negative (blue) rail so the other end hangs out over the end of the breadboard.
Bend this overhanging lead down so it contacts the lower LED leg, and solder them together. Snip off the extra and save it.
Snip your 2-pin header in half (or use whatever pin you have handy - even other resistor clippings), and stick it in the last hole on the "+" rail (nearest red stripe).
Remember that extra lead I asked you to save? Use to solder a connection from your pin to the upper LED lead.
Step 6: Now we test!
No? Try reversing the polarity of your power supply. Now does it work? No? Hrm. The LED should light using this power supply in one of these orientations. If hooking up power one way doesn't work, swapping the leads around definitely should.
Either you have a bad LED, shorted wires, or an incomplete solder connection.
If it lit up the wrong way around... well, now you have to make the decision whether to leave it like this, or desolder your LED and turn it around. Making it right is definitely the wisest course of action.
Step 7: Making the installation permanent
To do this, we'll use a trick I learned from Monty Goodson of Bittybot & "Fatman and CircuitGirl" fame (well, he's in the background lots) :
Use the clear plastic packaging that your breadboard came in to to flatten your hot-glue blobs into a nice, flat surface. Smother your parts in hot-glue, flatten the plastic against it, then stick it in the fridge/freezer for a few minutes. Once all the heat is sucked out of the hot-glue, the plastic will snap off, leaving a nice, flat, molded-like surface!
There. Now you've done one side, go do the other! I built mine so each LED is powered by a different set of power rails, which will make it easy to tell when I'm not powering both sides of the breadboard (that's been an issue for me).
Go out and bling your breadboard!