DIY Plant Containers

This past Saturday in Fort Greene, Brooklyn, after I finished beekeeping, I was walking towards the subway when I saw a store in the neighborhood that was displaying these cute succulents in these DIY concrete plant containers. Aren't these adorable? I have seen many examples of this on Pinterest and online, but this is the first time I saw it in person. I love the fact that they do not have "perfect" edges and look "homemade". It gives it character.

I'll have to try to make these one day! I think they are super cute! Have you made these before? Any tips for a newbie?