Currently, we need to develop a theme options from the beginning and the API Settings are limited. Googling I found a lot of frameworks* that turns the work easy. Why not implement an simple way to customize our theme like this?
Framework for Theme Options:
Options Tree, WordPress AdminPage Class, Options Framework Plugin, NHP Theme Options Framework, ProPanel WordPress Theme Options Panel, CheezCap – Cheezburger Custom Administration Panel, The UpThemes Framework.