Can I add icons to it

I was wondering if there was a way of adding design
to the Weather Watcher Live the same as the Weather
Watcher? Like icons and such?

Yes, it’s possible. The Weather Watcher Live icon set contains many more icons, so it’ll take some work to convert a Weather Watcher icon set to a Weather Watcher Live icon set. A lot of weather icon sets are based on the icons, so converting just about any set over is not going to be a piece of cake.