Here are the readings from the Revised Common Lectionary for next Sunday, which is Trinity Sunday and the first Sunday after Pentecost

Genesis 1:1-2:4a
Psalm 8
2 Corinthians 13:11-13
Matthew 28:16-20
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http://divinity.lib.vanderbilt.edu/lectionary/APentecost/aTrinity.htm

Denominational variations:

ACC: http://www.montreal.anglican.org/comments/atrinm.shtml
ECUSA: http://www.io.com/~kellywp/YearA/Pentecost/ATrinity.html
ELCA: http://www.plu.edu/~crel/wordlink/next-weeks.html
UCC: http://www.ucc.org/worship/samuel/s052205.htm
RCC: http://www.word-sunday.com/Files/A/7-a/A-7-a.html

Collect (ECUSA):

Almighty and everlasting God, you have given to us your servants grace, by the confession of a true faith, to acknowledge the glory of the eternal Trinity, and in the power of your divine Majesty to worship the Unity: Keep us steadfast in this faith and worship, and bring us at last to see you in your one and eternal glory, O Father; who with the Son and the Holy Spirit live and reign, one God, for ever and ever. Amen.

Almighty and everlasting God,
You have taught us that You are Father, Son, and Holy Spirit;
and You call us to worship you as One.
Although we cannot understand this Mystery, help us to believe it faithfully,
and bring us closer to you until we at last see You in heaven;
O Father; who with the Son and the Holy Spirit live and reign, one God, for ever and ever. Amen.

Sunday-school Lesson plans:

http://www.sundayschoollessons.com/psalm8.htm (Psalm)
http://www.sundayschoollessons.com/trinmles.htm (Matthew)

Younger Children: http://www.episcopalchurch.org/documents/Trinity_-_Young_Children_-_Cycle_A.doc
Older Children: http://www.episcopalchurch.org/documents/Trinity_-_Older_Children_-_Cycle_A.doc
Adults: http://www.episcopalchurch.org/documents/Trinity_-_Adults_-_Cycle_A.doc

http://Logrus.ca/HomeChurchWeb/LectionaryStudy.html

Sunday-School Crafts:

http://www.sundayschoollessons.com/trinmart.htm (Psalm)
http://www.sundayschoollessons.com/trinmtart.htm (Romans)

http://www.sermons4kids.com/ (http://www.sermons4kids.com/go_make_disciples.htm)

Pew-work

http://www.efree.mb.ca/lectionarypuzzles/in-awvv.htm#p01
http://puzzlemaker.school.discovery.com/
http://Logrus.ca/HomeChurchWeb/Pewwork_adult.html
http://Logrus.ca/HomeChurchWeb/Pewwork_middleschool.html
http://Logrus.ca/HomeChurchWeb/Pewwork_elementary.html
http://Logrus.ca/HomeChurchWeb/Pewwork_preschool.html