Maybe I think creating a new map style is quite easy for someone who is experienced with coding new styles. To be honest I really do not know the amount of work nor if you need server to render a new map style. Since quite a time I am looking for a map style that shows only buildings which are ilustrated in black. Not more, not less. No streets, no water bodies, no green areas. In architecture its called ground map (in german: Schwarzplan) and should give you a better visualisation of the structure of a town. Due to these structures it gives you also a reference of the historical development of a city. The often refered website (www.der-geograph.de) is a good posibility to render areas with the above mentioned style. My question to the OSM-Community is if it is not possible to create a map style which makes it obsolete to render areas tile by tile which takes ages like on that website.