A project that contains miscellaneous small ideas I have. They're usually not that useful, but may eventually prove themselves to have some kind of value. 

List of ideas shown:

Half-Duplex communication
Multiplexing using a single bit line (Two signals through one line. Could be useful for lines that need to carry more than 32 bits.)
A 32x32 pixel screen drawer (actually useful)
A Stopwatch (kind of maybe useful?)
The divide chip used by said stopwatch
A 16 bit binary to BCD converter