An example of a non-denominational dinner table prayer is: "Lord make us truly thankful for these and all other blessings. I ask this in Jesus Christ's name. Amen." A non-denominational prayer can reference the Christian God, as in the example above, or take a secular approach.
Traditionally, thanks are offered and a blessing requested while seated at the table prior to consuming a meal. The prayer is an expression of gratitude for the meal and for life itself. Whether religious or secular, a table prayer is generally short, consisting of a few lines. Religious versions typically conclude with "Amen."
An example of a common table prayer used with children is: "Thank you for the world so sweet / Thank you for the food we eat / Thank you for the birds that sing / Thank you, God, for everything. Amen."
A good resource for non-denominational table prayers, as well as prayers arranged by faith, is Lords-Prayer-Words.com. Humanist web sites, such as that of the American Humanist Association, are excellent resources for non-religious prayer material. Secular blessings often focus on expressing gratitude for nature's bounty. In large group settings, secular table blessings are a sensitive choice, because they are more inclusive of all faiths and belief systems.