The next thing that came to mind (after seeing the hillarious 1D-Tetris) was a one dimensional version of Dr. Mario which I will just call "Pills":

This game is not actually working at the moment, it just generates the test pattern that fills up 75% of the playing field and then drops in one pill of at a time. The pill is randomly chosen from six combinations of colors and are two pixels wide. The player has to rotate the pill in a way that the two matching pixels are adjacent. If this happens, the two pixels disappear and the remaining pixels are moved two pixels to the right. The goal is to stay alive as long as possible.