Singing in your chest voice is paramount to being a powerhouse vocalist. Here are some examples of singers who are using their chest voice.
Demi Lovato - Skin of My Teeth
This is a good demonstration of chest voice. However, Demi is also a great example of a singer who can sing through their mix well into head voice.
Colbie Caillat - Bubbly
Colbie is an example of someone who sings in a lovely lighter chest voice in the song Bubbly. This is a great beginner song for singers developing chest voice.
Bette Midler - The Rose
Bette Midler is almost an all chest voice singer. The rose is almost all in the chest and a great song to practice vibrato too.