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does anyone know where i can buy some leather sport pants. All I see are black. I'm looking for different color than just black. Like Grey, Silver or white. anyone ???????

Pretty much every single store that carries moto gear should have them.  I assume you're looking in sport riding stores not the old fart harley ones right?  There're even more of them online.
I'm a bit dumb founded by your question, its almost like asking "where can I buy some bottled water" - eh,  everywhere?.
You mean like this?
http://www.kneedraggers.com/details/Alpinestars_Leather_Track_Pants--610085.html

i've been looking around and i see a lot of sport or racing leather pants with knee slider etc.. . but all are black. any stores or website you know of?>

The link I posted has Alpinestars in blue,  red, or black.  Have you looked at it? There're many other options like AGV, Denise, etc, etc.  Usually the main picture everybody displays is black, but most will have options for other colors.
Here's another example
http://www.shopwiki.com/detail/?q=Supermoto+Leather+Pants+%28GunMetal%2FWhite%2FBlack%29&s=529884&o=122164585&d=Joe+Rocket+Women's+Trixie+Street+Leather+Pants
you gotta spend some time searching

yes i have looked at this web sites and they dont have the color im looking for black/white or black/silver