______ PTO-Vikings Value Volunteers - Join Us
Vikings PTO--The more oars in the water, the faster this ship sails!
Vikings PTO--Helping our children explore the new world!
Vikings PTO--There's strength in our numbers!
Vikings PTO--Ships Sailing Daily!
Vikings PTO--Join the Adventure!
Vikings PTO--Creating adventures for our children!
Vikings PTO--Creating new frontiers for our kids!
Vikings PTO--Helping them understand their world!
_____ PTO--Big Vikings helping Little Vikings every day!
Vikings PTO--Exploring the World with our kids!
Vikings PTO--Keeping the Adventures Alive!!!
Vikings PTO--Little adventures for the little vikings!
Vikings PTO--It's a whole new world out there!
Vikings PTO--Held together with spirit!
Vikings PTO--Explorers with an attitude.
Vikings PTO--Join Us and Join Tomorrow's Adventures!
Sounds like you are looking for more of mascot theme-oriented slogan. We went more frrom the functional/service aspect and used a black & white clipart of a schoolhouse and under that the words.
"Help us help the school!"
Of course, our name appeared elsewhere in bigger letters. I don't know that it officially was our "slogan" but the graphic was used on all our documents - letters, t-shirt order forms, announcements, etc.