Well this bit of news is actually getting old, butI thought I'd mention it here anyway. Sivak, memember of the nesdev and nintendoage forums, as well as posting here once in a while, has been busy learning how to code NES games and the results are now here.

GEMINIM
Based on a game called Nim. It's a board game that consists of rows of, in this game, gems. The players take turns removing any number of gems from a row. The last player to remove the last gem wins the game.

Download here

SIAMOND
Based on the game Simon. The game unit has four large buttons, one each of the colors red, blue, green, and yellow. The unit lights these buttons in a sequence, playing a tone for each button; the player the has to  press the buttons in the same sequence.

Download here
(link fixed)

The games are what I would call minigames and I don't think they're suited for a cartridge release for each of them, but maybe a Sivak Games Compilation cartridge would be made? :-)