Illustrations to complement website articles

I need some simple artwork for the website pages in www.effective-communicating.com. The graphics must be borderless, or such that the border is very faint. in other words, I would prefer the graphics to fade into the background (think transparent background). I want several varieties of images. One example would be photographic images (with the borders blurred or blended with the background), like stock photos. Another type would be simple objects, like a microphone. (can't find an example) Another would be simple clipart-like images. Best example is at [login to view URL] Also, these images are to complement the main articles on the website, not buttons or banners or others. The images would be weaved in between the texts. * Although I mentioned photographs, those should be kept at a minimum. I would much prefer more quantities of simple objects and clipart-style images ** A perfect example of what I need: [login to view URL] The first image falls in the photographs category, and the second falls in the simple objects category. *** If you can, please make a sample of an image that could be used in any pages of my website that you choose. You may of course insert a watermark on that image. Also, please let me know how many illustrations you will be able to provide, keeping in mind that I plan to have one image for the short and medium-length articles and two or three for the longer ones.