The new Google Hangouts website is available via hangouts.google.com and the background will change to show a new image everyday.
Google explains :
We are launching another way to use Hangouts today. From our new site you’ll be able to take advantage of the best of Hangouts in the browser, along with an inspiring image to get you through the day.
Message a friend or start a group conversation – Have a one-on-one conversation or include all your friends with group chats for up to 100 people. Say more with photos, maps, emoji, stickers and GIFs.
Connect anytime with voice and video calls – Turn any conversation into a free video call with just one tap. Talk one-on-one or invite friends for a group call with up to 10 people.
Stay in sync across your devices – Sync your chats from device to device and keep the conversation going wherever you are. Keep in touch with friends across Android, iOS and the web.