I was thinking of what to do with the spare 250 pixel nodes I used last year (5v) and went to Bunnings this morning, and picked up 2 of the 150cm tall spiral plant holders like in the OP for $12 each. I ended up putting 125 pixels on each today (that's a lot of cable-ties). They look fantastic.
This will have to be the last addition to this years display. I have to try and fit it into the last 1.5 universes on the P12R (750 channels all up).