==== Delay Based Memory ====
Create a piece of (analog? digital?) memory from some form of delay element:
  * Reflected Sound
  * Reflected Light
  * Long Coax
  * Sound in a mechanical medium

==== Peripherals ====
Use the FPGA to develop memory mapped peripherals for your softcore or existing silicon through an M2M interface.
  * Communication Protocols - SPI / I2C / CAN / LIN / etc
  * PWM generator

==== Emulation ====
Emulate an aspect of an old-school computer system.  Perhaps the NES?
  * ROM - Can we load a game into the FPGA and hook it to the NES?
  * Sound Generator


==== Graphics ====
http://www.essentialscrap.com/eink/