I am STILL working ( third week now) on the Church at St Antimo in Tuscany. I've quilted walls and floors of the 900 year old stone church.... but wasn't ready til now to work on the marble columns. Here's the unquilted crest top of one column.
A fine cotton seemed to work well in the crevices of the carved stone.
Bottom line, I think this will look okay.... 1 column crest down... 8 to go.