It is the textural elements of plants that I find most intriguing. When I am looking for plants at another garden or nursery, the foliage is very important. Grey, red/purples and chartreuse are often good colors to mix with other plants. Then I look for foliage that is thin vs thick, shiny vs flat or fuzzy, serrated vs smooth edged, round vs long. All the grass-like foliaged plants are particularly useful as are the round or paddle-like shaped leaves. When I put a composition together, I try to have a pleasing balance between contrast and harmony with both leaf color and leaf texture.