Our schedule is laid out in 4 week span. Each 2 weeks we work the following:
on - Mon, Tues
off - Wed, Thurs
on - Fri, Sat, Sun
off - Mon, Tues
on - Wed, Thurs
off - Fri, Sat, Sun
The other rotation works the opposite; if someone needs a certain day off, they exchange a day within the 2 week pay period with someone from the opposite rotation.
Hope this helps give u some ideas