Inkscape is FREE open source vector based graphic program with features comparible to Abobe's Illustrator or Corel Draw. It is available for Linux, Windows & OSX. Images are created in .svg format with features such as transparency, gradients, node editing, pattern fills, PNG export, and more.
This is a great program for producing graphics for your blog. Anything from header banners to favicons. With scalable abilities you can set the page scale to pixels so that you are creating your graphic to the exact size you need.
You can import your photo's in a bitmap format and add text and vector images giving you a capabilities of programs costing hundreds of dollars. Visit their home page to download this free program.
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