Usually, the silver is represented by using gradients of gray. Since you don`t want any gradients at all, here is the silver represented using just simple gray: #93
Here are some other earth tones:
- metal #94
- earth / clay / dirt: #95 #96 #97 #98
- sky #99
- grass / woods: #100 #101
- stone #102
If you don`t like any of the above or you wanna try other colors, here`s a link with the basic colors. Just indicate me the color code and I`ll color he hare in it:
http://en.wikipedia.org/wiki/List_of_colors:_A%E2%80%93FThank you, too.