Inkscape is a fantastic free Open Source vector graphics editor. You can use it to add a touch of class to your website.
Get Inkscape here
Inkscape has many filters that can be applied to images, like the ones shown above.
Filter Guide
Inkscape Insect
Inkscape Transparent Text
Inkscape Penguin
Inkscape Bowling Pin
Inkscape Rusty Gear
Interesting Bitmap Emphasis Technique
Inkscape Random Marbles
Inkscape Eight Ball
Inkscape Interpolate Extension
Inkscape blur and clip technique
Inkscape Swirls and Flourishes
Convert a Bitmap Image into a Vector Image
Inkscape Text Effects
Inkscape Shiny Glossy Button with Bezel
8 Ways to Select Objects
Gradients WITHOUT using the Dialog Box
Inkscape Clip Art
Inkscape Filters
Inkscape Special Effects
Glassy looking Shiny button
Shiny text on a reflective surface
Raised text with a shadow background