I have been wanting to skin the default calculator to match the black theme or the Dusk theme and I finally decided to go for it.
The DUSK skin is based on the Dusk theme by grzegorz10 over at xda, his work is phenomenal!
NOTE: This has only been tested on this ROM so I can't guarantee it will work on other ROMs.
There are 135 images between portrait and landscape mode and all had to be skinned 1 at a time!
BLACK
DUSK:
The attached cab files will install it for you, I have tested and it is un-installable as well.
When you install, be patient... It is slow (remember, you are replacing 135 images).
Restart after install and you're good to go.
gadget1