I did the same as upstater mentioned a few posts ago. Tapping into the map lights, the LEDs come on when the door is opened/car is unlocked. While driving, or whenever I want, they can be turned on by pressing the passenger map light (removed the actual light from this side so the map isn't on while the foot wells are on..although you could also just reverse the light so it won't turn on but is still installed). Positive wire is on the drivers side map, and negative is on the passenger.
It took me maybe 2 hours for this install, which included cutting and splicing all the wires and running them through the ceiling and down the door posts/under the dash. It could be done faster but I took extra time to do it right (so I don't have to clean it up later)
I used the same lights from Oznium https://www.oznium.com/super-bright-12v-led-module
They are awesome LEDs and come prewired which makes them super easy to install. I went with blue, as it's my fav color and I just think they look amazing at night. Ordered them on a Wednesday and they arrived Friday afternoon..what a great surprise!
Assuming you already have small wire and some connectors/heat shrink wrap you could do this for around $20 by buying two LEDs. I spent maybe ~$40 as I had to buy wire, connectors, heat shrink etc.
Either way it's much cheaper than the OEM kit that is over $150 and it's more fun to wire it yourself in my opinion.
Here are a few pics of the finished product, as well as some shots of where the wires are connected to the map lights.
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