Here is an collection of some pre-configured filter effects for Inkscape:
A good resource anyway is the Open Clipart Library:
Do you have a lot of time?
The development version now comes with a lot (129!!!) of pre-set filters:
Emboss light Text and two drop shadows.
Created for webdesign elements. Download
Gel filter Download
Multicolor glas Download
(But i think it looks more like fluid, so i change the example color with the Gimp)
Splat Filter Download
A brushed Metal Filter with 3D look. Download
Mixed Filter Pack Download
Distortion Pack Download
Gravure (black fill) / Glas (white fill) Download
Drop Shadow: Download
Some Filters are still integrated as examples in your Folder:
So, check out the Tutorial series from Niko Kiirala. He describe the filter effects existing in Inkscape and general information about using and creating filter effects.