Gloria Tibi Domine (Glory to you, O Lord)
This short prayer of praise and thanksgiving is said at Mass right before the reading of Gospel in response to the priests words, "Sequentia sancti Evangelii secundum..." (The continuation of the holy Gospel, according to...). I've written more about how we use this prayer in our family HERE.
Laus Tibi Christe (Praise to you, Christ)
This prayer is said immediately following the Gospel reading and echos the Gloria tibi Domine.
Deo Gratias (Thanks be to God)
This prayer is used a couple of times at Mass, most notably at the end when the priest says, "Ite missa est" (Go, the Mass is ended).
Armed with these three short prayers of thanksgiving you can offer up praise to The Lord of Lords and King of Kings throughout the day. Doing so will help you to grow in both gratitude and holiness.