For this project, I chose the following. Please note that these were my choices, and are by no means requirements (I'll list those later for the electronics). Of note..I'm an electronics/software geek first, and my experience installing outdoor structures is novice, at best.

1) 16x16 pavers to run along the sides.

2) Paver base sand

3) String, stakes, levels for laying out the pattern

4) 16x8 pavers, similar in height to the ones mentioned above, for the middle 'row'

5) Sacrete Permasand, or some 'sealant' to put down which will help lock the pavers together

6) Optional: Paver base panels (example: http://www.homedepot.com/p/20-04-in-x-36-in-Black-...). I used those, as I'd never installed a walkway before, and I was in a situation where digging was both difficult, and undesired (I was above some sensitive cables). This allowed me to save 4 inches of digging to place a rock layer. If you don't get this, you'll want 4 inches of gravel to place below your sand layer.

7) 2x4's...you'll temporarily use these to help frame in the sand, and to scree it. I'd say 2 for every 8 feet of the pathway (assuming 2x4x8), plus an extra one to scree the sand with.

For the electronics:

1) An Arduino...the variety shouldn't matter...an Uno would work fine

2) I will go over electronic calculations, but I used 2 USB cables which I ended up cutting the ends off of

3) 14 gauge wire...I used 100' rolls for my setup (Amazon had a six pack for a reasonable price)

4) 22 gauge wire - I used this for the signal wire

5) Lenghts of PVC pipe

6) I used 12 LED neopixel rings, and they've been amazing...plenty bright at night, and with that many LED's it makes things very flexible for controlling power draw. Link: https://www.adafruit.com/product/1643

7) Glass 'blocks' like those used for shower/privacy walls. I searched for glass blocks on my favorite local shopping app (offer up, let go, craigslist, etc) and found quite a few people/ offering them up for just a few dollars each. I purchased 14, and used 8 for this project. The extras are good for prototyping.

8) Rustoelum Frosted glass spray - This stuff was magic when combined with the glass blocks...credit to my wife for suggesting it, it really gives this project a great 'look' and also hides some of the challenges you'll face later when mounting the LED's. Example: http://www.homedepot.com/p/Rust-Oleum-Specialty-11...

9) Conformal coating (link: https://www.amazon.com/MG-Chemicals-Silicone-Modif...). This helps with waterproofing the electronics

10) CorrosionX HD spray - Again for waterproofing and helping avoid corrosion - Link: https://www.amazon.com/Corrosion-X-90104-Heavy-Du...

11) Clear Sillicone caulk and a caulk gun to apply it - This gets applied to protect the electronics, and as an extra layer of water protection.

12) (UPDATE 11/27/17: Please see step 6 below): For a better waterproofing solution and wire connection, instead of waterproof wire nuts, please substitute shrink tubing, and a heat gun. (Credit: Farkleman)

For the Solar panel system, you need three parts:

1) Solar panels - I used a 45 watt kit from Harbor Freight (They were clearing them out to replace them with 100 watt systems, which might be better suited)

2) Solar Charge controller - Mine came with the panels, but you can get them on Amazon pretty reasonably for under 40 dollars

3) Battery - I'm using a 35 amp hour battery, which provides me about 5 hours of solid 'on' time if I chose. With the motion sensor and limiting times that the panels are on, it gives me plenty of time.

The price for this project varies greatly on the length of the walkway, the type and quality of bricks you choose, machinery and tools you own vs. need, if you already have solar power established (or choose to go another way) etc. The most costly parts of this project were not the electronics, LEDs, etc, but the rest. I estimate it cost me about 15-20 dollars per light when I figure in the wire, waterproofing, led rings, etc.