Owning less stuff means you have less to maintain and less to worry about (Matthew 6:25-34, Hebrews 13:5-6). Therefore, you have more time, you save more money and you have less to replace if things are stolen or broken. You also need less insurance, or perhaps none. Committing to less TV shows (or none) means you have more time and that your time is more flexible, as you don't have to schedule a chunk of time for each show you watch.
Wearing less makeup (or none) means you save time everyday, multiple times during the day. You also have less worry and stress trying to maintain your makeup when you get wet or something affects your makeup. You don't need to spend extra time removing makeup when it's no longer desired. You can work towards worrying less about what other people think of what you look like, and you can free yourself from that meaningless societal norm.
True beauty isn't external (1 Peter 3:3–4).
Minimizing or eliminating unnecessary stuff means you can save money and resources by reducing or eliminating things such as cable television, makeup products, etc., just to name a few things.
You spend time and effort working every day to earn your money. How many hours a day are you working so that you can watch a certain TV show or afford some new gadget? What could you do with that time instead? Or could that money you spent all of your time working to earn be used for something more valuable (Luke 14:28)?
I'm not saying we can't have our entertainment now and then, but why not take a step towards simplifying your life? You don't need to change overnight. But why not take one step at a time. You can have less stress, more money, and more time. Your life can be more fruitful (Mark 11:12-14).
You can have more time to spend with friends and family. You can have more time and money to pursue hobbies that really matter to you. You can learn new things or travel. You can have time to simply rest; to enjoy what you have and reflect on life.
Most importantly, you can have more time to seek God (Psalm 14, Acts 17:22-31). If you don't know Him, you can spend more time searching for Him and learning about Him. If you do know Him, you can spend more time growing and studying. You can spend more time in fellowship and reaching out to others.
The apostles of Jesus even went as far to sell everything they owned to simplify their life so that they could help others and do His will. Jesus even expects that we let go of possessions, as they weigh us down in this world. Great wealth can be a stumbling block to getting into heaven (Luke 18:18-30). Don't underestimate the grasp that possessions can have on your life.
"For where your treasure is, there your heart will be also." (Matthew 6:19-21)
If you want some inspiration on living more simply and how it can improve your life, I highly recommend you check two blogs by Leo Babauta: mnmlist (http://mnmlist.com) — read the "all posts" archives — and zen habits (http://zenhabits.net). I don't know his personal beliefs about God, but I find his articles to be very beneficial for anyone of any faith. He is an example of someone who has simplified his life and has great things to show from it.
I've been simplifying my own life in many ways. I've been reducing unnecessary commitments and removing as much unneeded stuff as possible. And it feels great. I can focus more on things that really matter. I believe this is an important path everyone should take, for the benefit of themselves and others.
Why not simplify things even just a bit? It's pretty simple really.