here is a method to add clouds to your scenery: SVG - Sky Writing.xar.

Do try this only at home, it will kill a website almost dead as it is puffing out each cloud wisp individually.
You can preview it and screenshot the result. In the browser, avoid changing the zoom as it takes over 30 seconds to refresh.

It is close to bullet-proof as it will handle most objects: line, text, shape, image. All are rendered as SVG outputs.

In use, add the CSS Yellow Cloud icon to your site design page; it does not show when rendered.
Create an object and add a Classname of htmlclass="cloud".
Preview and adjust.
You can set the page background to affect the mood.

I've incorporated the concept of to make this work in Xara.