Crates and Barrels is a single-player "minigame" mod for Half-Life 2. It is a unique mod for several reasons, most notably for what it is not: it isn't a shooter (first or third person) - it isn't an RPG, strategy, or adventure game - and it doesn't run on the Source engine. What it is, though, is a collection of mini-games which use the Half-Life 2 characters, objects, and textures in several simple and classic video games that are intended for a few moments of comic relief.
When you start the mod, the first screen is a lobby from which you can select to play a specific mini-game. In the lobby and while playing each minigame, situational appropriate commentary is provided by the Half-Life 2 characters on your quality of play (or lack thereof).
I have been actively working on Crates and Barrels now for about four months. Unlike my prior mods, where I did not publish them until they were finished, I am planning on releasing an open Beta version of the mod for play testing and feedback first, then publishing the "final" release. Timing for the Beta is close - I am tentatively planning to publish the first Beta before March of this year, and possibly much sooner than that. But even after the "final" release, the mod won't be complete, as I am planning to add addtional minigames, additional levels for some of the games, and so on.
Very cool idea you have here! Reminds me of some of the gmod gamemodes created.