Flat design doesn’t seem to be going away. The popular use of pastel colors and minimalistic layouts is getting bigger every day, and even the biggest proponents of skeuomorphism (ahem, Apple) seem to be caving to the new focus on designing for the screen rather than designing based on the physical world.
For many designers, this might mean an entire overhaul of your site if you are trying to stick with the trends. However, before you go banging your head against the wall about having to build your site from the ground up, remember that any big web design trend probably has tons of free resources already available to help speed up the conversion.
This is obviously the case with flat design, and while there are scripts to help with making a flat web site responsive or managing navigation, there are also free sets that will help you fill out the details of your site with any icon you need in a style that will match your new page.
Speckyboy recently compiled twenty free icon sets that will help with navigation, social sharing, or payment methods that your users will be seeing. Designmodo also created their own personal set of icons they shared wih their readers designed specifically for social media and sharing.
The icons are all high quality, resizable PNGs or PSD files, and you won’t have to worry so much about the tiny details while you’re working on the bigger picture of your site. Oh, and don’t be confused if you think many of them look like app icons. Rounded corners and geometric shapes are a big part of flat design.