I like how some areas have themed streets.
Obviously, downtown has the tree and number streets going on...
Spruce
Walnut
Chestnut
Pine
Olive
Locust
and
1st-23rd (no 12th [Tucker] and no 5th [Broadway])
[Plus, there's 37th, 39th and 59th streets in South City, as well as even larger numbers I can't remember in U City off of Olive...hmm...]
I've always liked number streets.
I also love the state streets in Southeast City. Most of the U.S. states are represented somewhere in the City.
The Shaw neighborhood has some Garden-themed streets:
Shaw
Botanical
Flora
Magnolia
Spring (?

)
Also, Southampton has the English-sounding streets:
Murdoch
Nottingham
Devonshire
Sutherland
Macklind
Lansdowne
Hampton, etc.
I like how Hyde Park still has streets named after its (that is, the city of Bremen which was annexed by the City in the 1850s) founders:
Angelrodt
Destrehan
Buchanan
Mallinckrodt
I love how Grand has a South Grand stretch, a North Grand, AND an East Grand.
[More trivia] Streets with neighborhoods named after them (or vice versa):
Compton [Compton Heights]
Grand [Grand South Grand, Grand Center - yeah, I know they're not official]
Clifton [Clifton Heights]
Hampton [Southampton, Northampton]
Kingshighway [Kings Oak, Kingsway East, Kingsway West]
Penrose [Penrose]
Gravois [Gravois Park]
Shaw [Shaw]
Vandeventer [Vandeventer]
Lindenwood [Lindenwood Park]
Hi-Pointe [Hi-Pointe]
Skinker [Skinker-Debaliviere, Wydown Skinker
Debaliviere [Skinker-Debaliviere, Debaliviere Place]
Holly Hills [Holly Hills]
Mt. Pleasant [Mt. Pleasant]
McRee [McRee Town]
Goodfellow [Wellsgoodfellow]
Riverview [Riverview]
LaSalle [LaSalle]
Soulard [Soulard--does this actually run through the neighborhood...?]
Let's see...what else...can anyone think of St. Louis street names named after other cities?
I know of Nashville in Dogtown and Cleveland in Shaw.
Fun topic.