About filters in photoshop ...

I asked my Good Buddy Google and got 1,650,000 page hits for photoshop filters. 

Here are the first few ...

Photoshop Filters (freeware);

720 Free Photoshop Plugins And Filters;

Free Photoshop Plugins | Tutorial;

... even some from the source: Adobe Photoshop CS4: Plug-ins. 

That should get you started and/or tie you up this Saturday morning. 

--Martin