I've been planting in this stacking planter for a few years now. It sits in almost full sun in my driveway. This year I used a lot of things that were already growing in my garden or had been overwintered inside.
On the top are 3 Cordyline, the only thing I added new this year, I planted a few golden teardrop sedum around the ase of them that should train downward.
The next layer has some Senecio Blue Chalk Fingers and some Dichondra "Silver Falls".
Below that are some Anginlina sedum.
Next are some Sedum takesimense that should train down a little and have yellow flowers later in the season.
On the bottom are some purple heart plants.
I have no idea how it's going to turn out, but it should be fun to watch.