Praying is simply communicating to God. You can speak, shout, sing, dance, laugh or cry in your discourse to God or be completely silent, according to About.com.
The Bible records many circumstances where people pray in thanksgiving. With thankfulness comes humility, and About.com indicates that the best prayer is done in such a manner. Psalm 147:3 indicates that God heals the broken-hearted and binds up their wounds in response to a humble spirit.
The psalmist in 121:1-2 lifted up his eyes to the hills and found that his help comes from God. This example demonstrates that prayer comes in many forms, and God responds.