Nice colours, one for the watery people and one for the earthy people.
Souvenir sheet look like it would hold a cancel well, as do the stamps.
I like cancels!

I like the cover of the booklet better than the plain white (I think) stamps. Kind of ethereal in a way, covers more territory, more bang for the buck.
The designers could have perhaps (?) continued the booklet inside design over onto the stamps themselves and so created 10 different stamps maybe.
Very colectible with that idea. A small plating mystery to attract collectors and mini-collectors, something like the orchid flower issue.
edit: typos
Canada has lots of flowers issues and emmisions. Perhaps they could design a series of garden railway stamps to fit in amonst the flowers. Hint, hint, nudge, nudge, say no more, say no more.