After planting three troughs for others on Saturday, I was finally able to plant one for myself on Sunday. This trough will have almost no shade during the day, so we chose a group of sun-loving plants and used a very lean scree mix, with little organic material. Here's the lineup:
antennaria sp. (Beartooth collection)
penstemon rupicola 'Pink Holly'
erigeron x 'St. Mary's Peak'
acanthalimon bracteatum v. capitatum
erigeron (glacialis?) v. hirsutus
penstemon davidsonii var. menziesii 'Microphyllus'
I used our local NJ red sandstone, most of which I picked up around where I work. For mulch, I smashed some of the small pieces into even smaller pieces.