I made a thread about this a while back. Personally, I like the idea of a 10 day week, with 2 days off, 3 days of work, 2 more days off, then 3 more days of work. With how productive society is now, it's absurd we should still be working 8 AM to 5 PM 5 days per week.
If we still want to have a similar work time/rest time ratio to what we have now, you could instead do 2 days off, 3 on, 1 off, 4 on.
Either way, you end up with a consistent 30 3 week month where the dates always fall on the same day of the week every month, with 5 extra leftover days at the end of the year that can be a holiday. That also helps holiday planning, because the holidays always fall on the same day of the week every year.