Creately is a web-based system that lets you design all sorts of graphics. Think of it as a desktop publishing program, with lots of ready-to-use templates, that runs directly in your browser so there's nothing to install. You can then save your finished work as an image or PDF file, to use wherever you like.
A basic account, with a limited set of templates, is free. You'll find it at www.creately.com and it's great fun.
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