Thomas, I think Fvwm-themes could be always together with Fvwm.
A newbie has too much dificulty do strip interest parts of fvwm-themes.
I tried to do it once and I couldn't. Since most "screen-shots" you
present on fvwm.org make use of it, it almost doesn't make sense.
But I don't want to make this discussion as long as other similar ones I
have seen here.
Sometimes fells like Fvwm bleeds for problems too easy to solve to
justify, see!?
Fvwm-themes, ALT+TAB thingy, a documentation project detached from the
main website, also a wikipage...
Kind regards.
But to be honest, condensing something akin to fvwm-themes might be a
better option.