Interesting look. Took a lot of stones to fill and I bought the smallest size trellis assuming that could end up be a possibility (I'm really glad I didn't go larger, I think I would returned right away once seeing size/capacity up close). You also need to use a bigger sized stone (probably 3 inch at least) because most will fall right out of the spaces. That can either be incredibly time consuming or get costly quick. I intend to try to grow some clematis vine/bush over it.  Definitely unique.