Perhaps having one fully set up with like soil, plants all set up inside one to give people an idea of how it'll look when they use it and also it would show people exactly what it is at a glance (cause people are not so quick to associate things like this to gardening)
That might garner more interest, like really sell the grow your own stuff vibe.
I thought about that, but it takes a while for things to grow and I didn't have the time to mess with it. I had the transparent one set up and running so they could see what was going on inside with the water and such. The ones I have growing are all much bigger and set up in my little greenhouse so that wouldn't work.