OOD / OOP Etudes / Code exercises

I've been searching the web for some time now. I am looking for small sample exercises for OOD practice (& for some internal TDD workshops).
If there is one single place, where this need is being served, please point me to it.. and close this question

Constraints:

Language-agnostic real world problem
Small : Something that takes an hour to two at max to solve (or has sub-parts that can fit this constraint).
Not Algorithm centred : Not be focussed on just solving a computational task. (There are multiple sites that serve this category.) Involve > 2 interacting entities.
Solved by multiple people, preferably yourself : Goodness verified. Links preferred. Please do not post something that may be a good exercise... subjective

Similar SO question 60109, but the answers dont meet my need here. I found that I've lost my touch (was thrashing ideas) with OOD after prolonged exposure to a day-job. Need to get it back..

Update: Are we collectively out of short OOP exercises ? I was hoping that I'd have a bunch to pick from. However my web-searches (this is a diff exercise in formulating the right search string) and the lack of responses here seem to indicate otherwise. Maybe I posted to SO at a bad time.. in which case bumping this thread for more responses.

Gishu 2009-08-21 09:38:26

Doing the BinaryChop exercise is a favourite of mine. The examining different approaches part is what keeps me coming back to it. I try to do it for a week or so every couple of months.Kindness,Dan

Daniel Elliott 2009-08-21 10:26:36

These seem to be rules of thumb or guidelines for better OO design. I am looking for short problem statements or scenarios to try and model in an OO manner

Gishu 2009-08-21 09:42:24

I see what you're saying, but they're generally presented as a set of rules to follow in the context of a ~1000 line program - developing in this manner, regardless of the problem being solved, will help your design skills. I think that for really learning, the specific problem is not as important as forcing yourself to learn new techniques in solving it.

kyoryu 2009-08-22 07:30:32

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OOD / OOP Etudes / Code exercises

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