There are so many newly released icon sets which are free to download and use in your own projects. Building a website application will take a lot of time and patience. If you are using a CMS or backend programming framework then it might shave off some time. But overall you will be dedicated to finishing your projects in a decent timeframe. It is worth taking any help which can hasten the completion date.
I feel these small user interface icon sets will provide a lot of benefit to web developers. Creating webapps specifically for mobile and desktop computers are not easy to design. Why should you have to make all your own icons from scratch? It becomes a lot easier when you know exactly what you are looking for. Check out these freebie icon sets and see if you can locate designs which may work well in your own projects.