You can download vector images from many websited, like Vector Stock for Example.
However the image will not be directly downloaded in .SVG format.
Normally it will be downloaded as .ia (adobe Illustrator format).
You will need to open the .ai file in Illustrator and then run the opcion in Illustrator that says "SCRIPTS - EXPORT AS SVG".
Once done that the file will be converted to .SVG and now atvise can import it into any screen.
The first time you import it you will need to "Ungroup" it so you can work with the SVG as desired.