Here is a collection of projects that are really part of a bigger project, but that might be useful for your projects, e.g adding an LCD screen or using a GPIO pin.

• 2 Line LCD Display
  
• I²C LCD Display
  
• 2.5" SPI LCD Display
  
• GPIO LED Control
  
• GPIO Inputs - Button LED Control
  
• GPIO Inputs - Button LED Control using an Interrupt
  
• GPIO Control from Command Line
  
• LED PWM Control
  
• Use a Stepper Motor