Hi Mark,
Thanks for sharing information about Creativity Boxes. My first reaction would be – sure, go for it! I have advocated for the use of any bricks for your LSP session. I have tested various sets myself and they work nicely. There was a blog post that I wrote about this a long time ago on the arguments that I have used:
Do It Yourself Lego Bricks Set for Serious Play Workshop
In our latest book Serious Work (see pp 74-80), Sean Blair and I have also written about some ideas regarding bricks, advocating for the flexibility and pointing out the importance of identifying the bricks that help building metaphors. We have just suggested the first time users be careful about the use of “themed sets” unless you really prefer Snow White and 7 Dwarfs or Chewbacca and R2D2 to be central pieces of your upcoming LSP session.
David Gauntlett also wrote this interesting piece about “micro builds” on using tiny Lego Friends sets as a really useful alternative that seems to be very closely associated with your Creativity Box: http://seriousplaypro.com/2014/08/20/micro-lego-serious-play-how-small-can-a-useful-tool-for-thinking-be/
So – try it out and let us know how did your session go!
Good luck!
Marko