Seems like a million years since I last ran a theme league, so...

The 90M 5 Year Window AL/NL League

Cap: 90M
AAA: 6/2 Below Average
DH: No
WW: No
Clones: No
Trades: Yes

Pick a 5 year span (the span must start or end with a 5 or 0.) 
1900 - 1904 / 1905 - 1909 / 1911 - 1915 / 1916 - 1920 as examples

Pick a league AL or NL.

Pick a team consisting of player seasons from that time span and that league  (partial/combined seasons ok... no clones)

Pick a stadium used by a team in that league during that time span (not exclusive)

Once a League/Time Span is taken it is exclusive (ie only one AL 1925 - 1929 team will be allowed, but another owner could have AL 1926-1930 or NL 1925 - 1929).

In the end there will be 12 AL and 12 NL teams... and they will be split into leagues accordingly.

I'll pick my years/league/stadium once 12 teams have entered.

American League
1.  alston AL 1906 - 1910
2.
3.
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11.
12.

National League
1.
2.
3.
4.
5.
6.
7.
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11.
12.

SM list: eastvanmungo; alston: nmchnv

If anyone has any questions or requires rule clarifications, feel free to post here or PM me.

American-1906-1910

Alston, thank you very much for joining.  Hopefully this will get the wheel rolling.

I am interested, I just haven't figured out which timeframe.

I'll put you on the SM list.  Thanks!