Well, I thought Potions were more like...
Well you know the purple bottle sprites they show in later games? I thought of those, but with a small needle that you injected your Pokemon with*.
Ragecandybars were depicted in my mind as a reddish-brown candy bar that was over filled with little candy beads.
I thought of Exp.Share as a tiny machine that had cogs poking out all over,
I saw all "Heals" as little bottles of yellow liquid that had a similar syringe that came out of them at a 90 degree angle*.
TMs and HMs were seen as the Discs we're always shown, (even in Gen II it shows a sillhouette of a Disc) but I used to think you put them in a special machine that would dispense a drink that the Pokemon would drink, allowing it to learn the move. You just never saw that part.
*It didn't hurt them of course. You simply poked it into their side, and to them it felt like nothing more than a soft pinch.
Interesting question!