I think Praise described it well, to be a good singer the songs should come from you. Its a good idea and fun to experiment with different styles of singing and find out which things you like to do and which you don't. Take a song you know really really well and then sing it several times over pretending to be some other kind of singer, operatic tenor, gravelly voiced Tom Waits, whispery and personal intimate singer, cheesy lounge act, etc. You can discover things about your own voice and the song if you do that.