Is it possible to change the phone app and lancher on a custom rom ?

[P Desilva]

I downloaded a custom rom and I really don't like the layout of the phone. And also, I don't like the launcher. I tried getting launchers on the market but the launcher I downloaded I can use my Widgets and custom themes and skins. I was wondering if there is a way I could get another launcher that I can use my skins, Widgets, and themes. If so, please help! Thank you