My favorite one has to be the spee-boop. Something about the design just appeals to me; it almost looks like a Constructicon from Transformers G1. Splendid work!
My favourite is Wiggs, also this is just a suggestion but can you make an alternate build of the Lego creator 31130 sunken treasure mission if you have the set?
I combined this X-pod with the wild pod to create a creature reminiscent of a chimera once. If I could post pics in the RU-vid comments, I'd share a photo. I still have the model.
I had never heard of these sets, until Brian Bricks started to do some reviews on these. I love the concept of having a container where you can store the spare parts of whatever you decide to build with them, and have said container as part of the system, meaning you can use it in your builds. It's great to see that you came up with loads of alternative builds for it, all on the theme of Halloween. My favourite one is definitely the wizard, especially since it can sit inside the pod!
I used to be obsessed with creator pod sets as a kid, I remember they were all listed on the early Lego website I think? And I would just spend hours going looking at the photos over and over again. Glad to see you posting again and really glad to see you using these older sets!