Free Spring Nature is a lovely screensaver which includes lots of images related to the Spring season. The screensaver is a kind of slideshow containing multiple images including flowers, trees, animals, lovely landscapes, and waterfalls, to name but a few. All the images look great and they are shown with a different transition effect. The screensaver also has relaxing music to accompany the images, but if you don't like it, you can mute it or add your own music playlist from the settings menu.
Fortunately, the screensaver is very customizable and it has multiple options. You can customize the time the images remain on the screen, their order (sequential, random, shuffled), image size and position on the screen, transition effects that you wish to see and their speed, and exit conditions. Moreover, if you want you can add a flower-shaped analog clock that will appear in the bottom right corner of your screen.
In short, if you are looking for a beautiful and very customizable screensaver with a happy theme, Free Spring Nature Screensaver may be an excellent choice.