Bonjour Frédéric,
Personally, I haven't made my own maps yet, although I played with the idea several times.
The kowoma map goes a bit in the direction of the Swiss maps:
http://www.kowoma.de/gps/freieKarten/osmkowomafreizeitkarte.html
But when it comes to the differentiation of different types of paths and tracks, my favourite map is the one from openmtbmap.org. Extremecarver used to publish his style files under CCBYSA, but stopped doing so about a month ago. If you are interested, the last version I got is from 23.6.2012.
Salutations, Thorsten (Shernott)