I2C LCD Display

LCDs are a great way to display simple information (like an IP address) without going to the expense of a full LCD panel, or connecting a monitor. For my previous LCD I used a 2 line LCD in 4 bit mode, this is a very simple implementation, but it uses lots of GPIO pins.
Another way to connect an LCD is to use the I2C interface. This only requires a total of 4 wires, two for the data, 2 for power. You can buy LCDs with built in I2C adaptors, I got mine from eBay, I can't really link it because the links to eBay items seem to die fairly quicly.
If you do a search for something like this:

Yellow Green Serial IIC/I2C/TWI 2004 20X4 Character LCD Module For Arduino

Then you should find what you are looking for.
Here is the description for what I purchased (obviously you can ignore the Arduino references)

Yellow Green Serial IIC/I2C/TWI 2004 20×4 Character LCD Module For Arduino

Dedicated IIC control for Arduino, it only takes two IO
Adjustable contrast, the backlight control to provide library
High quality LCD screen, Yellow Green, clear display
IIC bus control, it only takes two IO ports
Backlight control, you can control via a jumper, you can also program control
Adjustable display contrast
5V power supply, the device address 0x27
Compatible to Arduino

There are many of these available on eBay in 2016, and they average around £3.50-£4.00
Here is one connected to a Pi Zero (1.3)
The most tricky part of getting any LCD to run is finding a driver/library for it. I have followed a tutorial from a chap called TheRaspberryPiGuy who you can look up on YouTube.
This guide assumes that you have installed Raspbian (or equivalent) and updated everything with the following commands:

sudo apt-get update
sudo apt-get upgrade

On the LCD the four connections will be labelled something like:

LCD R-Pi
GND (Ov) Pin 6
VCC (5v) Pin 2
SDA Pin 3 (GPIO2)
SCL Pin 5 (GPIO3)

Once the OS is installed and the LCD is connected, the libraries can be installed:
From the command line:

git clone https://github.com/the-raspberry-pi-guy/lcd
cd lcd
sudo sh install.sh (RPi will auto reboot)

Once the Pi has rebooted:

cd lcd
edit lcddriver.py to ensure the ADDRESS = 0x27 is the correct address (some are 0x20)

I found this guide by doing this YouTube search:
Raspberry Pi - Mini LCD Display Tutorial by TheRaspberryPiGuy