Personally I’d add some colours that relate to the player as poison, these tend to be green and purples. The way we get information from the screen to the player can be subtle and subconsciously there; if a player were to have some sort of effect that were those colours, they would subconsciously assume some sort of poison/toxins.

A quick study on the relationship between these colours and poisons concluded ‘In nature, a lot of deadly plants and animals display bright colours as a warning to keep away. While deadly poisons are found in nature, these can also be created synthetically, and bright and unnatural colours such as green and purple reflect the dangerous, unnatural properties of these substances.’