Can anyone show me how to get new skins on my phone?
to the Droid Forums. You probably want to visit this thread: Droid Themes - Droid Forum - Verizon Droid & the Motorola Droid Forum.
That would be your best source for that information. Glad to have you on board.
Are you looking for backgrounds? Because there is a great app in the market called "backgrounds" that is free. Also if you look in the market you can find live wallpaper for your Droid (I'm assuming you have a Moto Droid or Incredible.)
There should also be other examples of themes, skins in that section I sent you too. Have a look around. If you want to root your phone that's a bit complicated depending on how computer savvy you are.