I always liked the little firguines/action figures... fond memories of
Battle Beasts, though I had no idea what they were called until I did a google on "mini figurines, 80's, color chaning stickers" (and sorting out the transformers stuff

).
Also loved the
Monster in My Pocket figures (though, that phrase now generally illicits a slap from the nearest woman).
I don't remember having any of the figures, but I remember the
Centurions from a coloring book that I loved. I *think* I may have had the blue figure (first and second pic on that link)...but I can't remember for sure.
I do remember coloring in the book from a hotel room in south carolina, on our way down to relatives in Florida. My dad went out and got us subway for dinner. Itallian BMT on itallian bread...first time I had it that it ever came with pickels, and mayo AND mustard...and I loved it (I've ordered it that way ever since). I would have been about 7 years old (almost 20 years ago! wow)...isn't it amazing the random things you can remember?