Here's some stats for an urban druid concept I've been toying with. It is by no means done, and the spell listing still needs to be done. It was based off of the 3.0 druid, no idea what modifications it would need to bring it in line with the 3.5 classes. It was originally intended for a "modern" fantasy game, with both high levels of technology and magic.
The Urban Druid:
HD: d8
Skills: 4 points per level
Concentration, Craft, Diplomacy, Gather Information, Heal, Hide, Intuit Direction, Knowledge:urban or local, Listen, Move Silently, Profession, Scry, Spellcraft, Spot, Urban Lore
Saves: good fortitude and will
BAB: 3/4
Weapons and armor: same as the rogue
spellcasting: use druid progression from the phb
level: special abilities:
1 Urban Sense
2 Ignore Traffic
3 Fade into the Pavement, Uncanny Dodge(dex)
4
5
6 Uncanny Dodge(flank), City Scurry+10
7
8
9 toxin immunity
10
11 Uncanny Dodge(+1 vs traps)
12 City Scurry+20
13 1000 faces
14 Uncanny Dodge(+2 vs traps)
15 timeless body
16
17 Uncanny Dodge(+3 vs traps)
18 City Scurry+30
19
20 Uncanny Dodge(+4 vs traps)
Urban Sense: The druid has a vast array of knowledge and an uncanny supernatural sense of the city. He can tell roughly where the nearest subway should be, if that hotdog vendor is safe to eat from, and where the best place to hail a cab is.
Ignore Traffic: At 2nd level, the urban druid has learned how to effectively move through crowds. Due to his connection with the spirit of the city, people or vehicles part just enough to let him pass. The druid suffers no movement reductions due to crowds. Police blocks and people actively out to stop the druid are unaffected. This ability functions if the character is on foot or driving a vehicle.
Fade into the Pavement: +10 to Hide checks in an urban setting
Uncanny Dodge: as phb
City Scurry: +10 move in an urban environment. This bonus increases the listed amount as the druid advances in level.
Toxin Immunity: At 9th level, the urban druid becomes immune to the effects of the high levels of pollution he lives with on a daily basis. He is immune to poison gases and mineral-based, inorganic, or entirely artificial poisons. He is still vulnerable to most organic poisons however(ie snake venom). This doesn't render him immune to radiation poisoning either.
A Thousand Faces: Change self at will. Takes a standard action and is a spell-like ability.
Timeless body: as per phb
As for spells, the traditional druid gets spells relating to plants, animals, weather, and the elements. The urban druid should get spells relating to people, buildings, pollution, asphault, concrete, steel, glass, and possibly electricity or steam, depending on the tech level of the game.