It seems to be any place that has the tiny yellow or blue flowers on it... most likely tile overlay issue or something... though there are also some hidden spots with small amount of silver hiding away. Only occurs on walls that don't have the vine wall texture showing also known as West, South, and East facing walls
Viewing post in Crossdressing in Camelot comments
It's unintentional. The flowers are set by default to not block movement, as you can obviously step over flowers, but when they are put on walls, it makes it so you can walk through them as well. The area with the leaves in front of it that gives silver is the only intentional one. I'll go back and fix that, thanks.