We have 5 standard styles for map configuration, but there are many more:
map_config=
values: 3201, 3202, 3203, 3204, 3205 [New technology & new Styles for print maps]
values: 4201, 4202, 4203, 4204, 4205 [New technology & new Styles for online maps]
values: 201, 202, 203, 204, 205 [Old technology, but still popular]
Here are some examples for map config styles:
Style 1 (3201)
Map - Europe
Map - London 1
Map - London 2
Style 2 (3202)
Style 3 (3203)
Style 4 (3204)
Style 5 (3205)