One day, I was thinking about the challenge of scoring a poker hand with wild cards, and when I sat down to puzzle out the problem it started blossoming into a whole program. I just let it blossom; it felt natural to express the solution as a program, and it felt natural to let the program be a complete entity and not a fragment.
This is a simple API for a video poker game that handles Deuces Wild, Joker Poker, and standard video poker. The core idea is that there is a Deck object, made of Card objects, that can be dealt into a Hand object - and the Hand responds to #discard, #draw, and #score requests via the Scoring module. Further documentation is hosted at RDoc.info.
I'm proud of this project because it's polished beyond just the code. The code itself is, I think, concise and efficient while being easy to read and maintain. It's namespaced, modularized, and well-documented. Finally, I took the time to learn some new GitHub hooks (RDoc and TravisCI). In short, I'm happy because this isn't a hobbyist's project - it's a journeyman's project.