Some website to get new an idea for your app

https://dribbble.com/shots

http://inspired-ui.com/

https://inspirationmobile.tumblr.com/

https://www.pttrns.com/

https://www.uxapprentice.com/

http://uxmastery.com/

http://ibuildapp.com/marketplace/Templates/?all=1

https://www.awwwards.com/

https://unsplash.com/

https://ios.uplabs.com/