Hello ludochka556 and welcome to the forum.
On Arwen-Undomiel main site there is a huge selection with avatars and banners you can use. It's under Media and here's the direct url to the avatars:
http://www.arwen-undomiel.com/avatars.html
Also you can ask for avatars on the Graphics Request board here. There are a lot of talented graphic makers who would love to make a costumized avatar for you.
Enjoy yourself here and feel free to PM me if you have any questions or concerns.