Sometimes, the colours of mount-board available just don't suit certain pieces of work. I think calligraphers especially have this problem, as the paper is often as much a part of the work as the calligraphy & any decoration. Black or white paper, & hand made papers usually look more streamlined if the mount is covered in the same paper as that used for the lettering.
It's really quite easy to do....
an extra little strip on the inside is especially important when using dark/coloured paper
~ if the mount shows underneath it can be quite unsightly, but this helps disguise it.
we could stop there, but now & again, an extra layer of sheer, gauzy tissue
adds another dimension ~ in this case
japanese sanwaa tissue, with gold & silver flecks in it.
you could actually cut the paper flush to the mount at the external edge,
especially when the paper is stiff or bulky, as i did below...
don't forget to fold the paper tight against the mount before you glue
for a nice clean edge
This is the finished piece I showed in the earlier post here