do we have the chance to have a skin design features of a mobile.

Yes. Assuming you are using Flex and Flash Builder, in Flash Builder, create a new MXML Skin.

1. Right click a directory in your profject (it is a good idea to create a new skins package. They multiply quickly)
2. Choose a name for the skin
3. Choose a Host Component for the skin (button, slider, scroller, videoplayer, etc.)
4. Make sure you "Create As Copy Of" a specific skin class (whether it be the base skin, such as ScrollerSkin, or a skin subclass, such as VScrollBarSkin)
5. Create
6. Add in your own MXML Spark components. You can either use the ones already present in the skin as a base or overwrite them entirely. It's entirely up to you.