A very good idea and indeed those kind of stations can easily be made.
There is one catch though, and that is that these stations are underground and thus have to be connected by tunnels and it would be nice then to have tunnel entrances/exits that also have matching graphics to those parks.
There are two possible solutions:
1. Work with overlapping tiles (I am already using something like that for the Metrostations in the Dutch Addition Sets, but not with park graphics)
2. Create a matching trackset, that not only has tunnel entrances/exits with park graphics, but also has covered tracks.
2. Is a very nice way to go (as overlapping tiles always will have glitches), because you are then also able to cover up trackswitches and signals. And thus your stations can handle traffic better, with those things close to them and not before a long tunnel.
Foobar has worked on something like this a while ago, his Metro Track Set: viewtopic.php?f=67&t=49476&hilit=metro+track+set
In that case the tracks and tunnels are covered either with concrete or grass tiles, but it should not be difficult to change the graphics to nice parks or possibly even houses.
Option 1. is the easiest way to go for now, but 2. would be better...
Hopefully someone will pick this idea up (I am far too busy with my own projects to also do these stations and I have never coded a trackset)!
Winner of the following screenshot competitions:sep 2012
, jan 2013
, apr 2013
, aug 2013
, mar 2014
, mar 2016All my work is released under GPL-license (either V2 or V3), if not clearly stated otherwise.