I found some of these ideas and products interesting.
https://www.youtube.com/watch?v=SyHixtwT6Zs
@ 1.45 Interlocking blocks.
@ 5.39 Awesome spray-on coating. If UV stable, heaps of applications.
The rest of the stuff is cool, but those two above stood out.
BTW, that paint roller cleaner is old. I had one 15 years ago.