One of the designers of my website create a new imageset for newbb 4.3
It uses the harry potter font for english language and also a user-defined font for persian ones.




Please download here:
newbb 4.3 imageset for wizards
To implement you dont need to touch newbb module .
Just copy them to your default theme to make it apply in your all themes OR copy to your specific desired theme.

for more information please read here:
customization of newbb imageset