What is legal as a poison mark?

[Piterr]

Hi.
What can I use as a poison mark? What is a maximum size of it? Is Nidoran (or any other pokemon) figure from Pokemon Figure Game ok? I ask because it's so much bigger than normal, theme deck poision mark or coin. Also, can I just use dices with in other color on poisoned pokemon (I mean, I'm using blue dices as damage counters. Is it ok if I switch them into green dices on poisoned pokemon and switch them back when pokemon isn't poisoned anymore without using any other things like coins which says that pokemon is poisoned/burned)?

 

[PokePop]

Many things can be used as Poison or Burn markers, but I can't give approval to everything.
As you note, size may become an issue. Is it so big that it makes it hard to see needed info on the card?

Dice would be confusing. Are they damage counters or condition markers?

Best to discuss this with the HJ at your event and get their ruling on specific items that "push the boundary".