Karim007*, there's no need, just do what feels good and fun for you.
But the conversion of isolated elements makes them ideal for use as resources to apply in backgrounds and even chars. I think the variation of the samples is the best.
Even if you feel inspired, you can create your own
topic in the
Mugen Resources section and share your new sprites. As I said before, it is a good contribution for MUGEN and OpenBOR creators.