Custom widget using svg files

I want to develop a custom widget that will use svg files, to improve its design quality, for example a tank level signaling, of course using QtSvg Module...Now, I'm new using svg files, so I dont't know how to create it. I want to know if there is any application to create svg files, or if I have to create them myself??
on the other hand any sample code of a custom widget that use svg files, be well received
thanks
excuse my English!

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I want to know if there is any application to create svg files, or if I have to create them myself??

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http://lmgtfy.com/?q=svg+file+editor

Thanks a lot, I have it in the repository here in my college