Now don't get me wrong, God expects us to ask Him for things - He knows we are going to and He knows what we need. However, He also expects (and desires) our thanksgiving.
In Philippians 4:6, Paul tells us, "Be anxious for nothing, but in everything by prayer and supplication, WITH THANKSGIVING, let your requests be known to God."
God deserves so much praise for the things He has given us. We are amazingly blessed with so many wonderful and beautiful things. We need to be careful that we don't become greedy or spoiled and that we don't take these things for granted.
Next time you pray, try (it's more difficult than you think) to say a full prayer to God without asking Him for anything. Instead, construct your prayer on thanking Him for the blessings He has given to you. It's something that we should do daily.