You could build a Temperature and Humidity Sensor, in order to monitor room temperature or help you grow vegetables thanks to the readings.
If you are the gaming type, you could always build an Arcade Pi.
What about a Pi Drone?
Of course the Pi, could also be used to learn how to program.
Thanks to its very small form factor, it makes a great pentest device to carry on site.
Techy people could also use it as a Pi OwnCloud server in order to share files, manage calendar/contacts and much more !
As you can see, many things can be done with a $35 Pi 2. In a coming article, we will detail this usage, so stay tuned!