Here’s an opening collect for Palm Sunday from the Starters for Sunday website.
Opening Prayer: Palm Sunday
Lord Jesus Christ,
on the first Palm Sunday
you entered the rebellious city
where you were to die.
Enter our hearts, we pray,
and subdue them to yourself.
And as your disciples blessed your coming
and spread garments and branches in your way,
make us ready to lay at your feet
all that we have and are,
that we too may bless your coming
In the name of the Lord.
~ posted on the Church of Scotland’s Starters for Sunday website. http://www.churchofscotland.org.uk/