Alternative version of File:London Underground Overground DLR Crossrail map.svg which demonstrates design concepts further deviating from the Transport for London official standardisation of tube map design:

Each London Overground service is distinguished by different color instead of the monotonous orange (this color is still applied on the "Overground Watford to Euston Line").
All London Overground services are given unofficial shortened names instead of merely being indicated by termini they serve[1].
Edgware-Mornington Crescent-Charing Cross-(Battersea) branch is separated from Northern line based on realistic likelihood of the Battersea extension and expansion of Camden Town station.
Tariff zones except zone 1 are hidden by default and only appear in the interactive SVG format by clicking/tapping the button at the top-left corner.
National Rail connections to 4 other airports beyond Greater London (but still marketed as serving London). The interactive SVG provides a switch for highlighting airport railway connections.This diagram attracted media attention in mid-2015 but should not be used in place of the standard version in most circumstances.
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Own work
Sameboat