Put Bootstrap's responsive design features to good use

http://www.techrepublic.com/blog/web-designer/put-bootstraps-responsive-design-features-to-good-use/

45 Cool Long Shadow Flat Logo Designs (+ 4 free LS Generators)

http://designbeep.com/2013/10/03/45-cool-long-shadow-flat-logo-designs-4-free-ls-generators/

Freebie: The Flatimus iOS UI Kit (PSD)

http://speckyboy.com/2013/10/01/the-flatimus-ios-ui-kit-psd/

Lifting the lid on the iOS 7 UIPicker

http://blog.ittybittyapps.com/blog/2013/09/20/lifting-the-lid-on-ios-7s-uipicker/

7 Responsive Design Tips For Your Next Website Project

http://www.adrants.com/2013/10/7-responsive-design-tips-for-your-next.php

Free Flat UI Kit

http://enfuzed.com/free-flat-ui-kit/

Arctic Sunset – The Clean UI kit from PixelKit

http://www.underworldmagazines.com/arctic-sunset-clean-ui-kit-pixelkit/