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From the Wikipedia article on silva rerum:

In historical Poland it was written by members of the szlachta (Polish nobility) as a diary or memoir for the entire family, recording family traditions, among other matters; they were not intended for a wider audience of printing (although there were a few exceptions); some were also lent to friends of the family, who were allowed to add their comments to them. It was added to by many generations, and contained various information: diary-type entires on current events, memoirs, letters, political speeches, copies of legal documents, gossips, jokes and anecdotes, financial documents, economic information (price of grain, etc.), philosophical musings, poems, genealogical trees, advice (agricultural, medical, moral) for the descendants and others - the wealth of information in silva is staggering, they contain anything that their authors wished to record for future generations)

--Once, my rommates and I started a sort of intragenerational silva. It traveled the world with us for about a year before fizzling out. How illuminating it would be to read now. What a perfect time capsule of our brains working together for that year, thinking of each other, trying to provoke each other to laugh or ponder or create.

Spin-off diary ideas:
Couples' diary (a la the Hawthornes)
Family cookbook
Commonplace book (a la Lovecraft)

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