Deuteronomy 16:17 Each of you must bring a gift in proportion to the way the Lord your God has blessed you.
Right from the beginning, man has been encouraged to bring gifts back to God; not as a demonstration of anything other than what He has blessed you with!
Before you give something back to God, sit down and go through some of the things He has given you, has blessed you with and has done for you.
After you have done that, think about what you could give back to Him in order to thank Him for all of those blessings and gifts!
Then do it!