in nature most colorful things are venomous / poisonous, why are flowers so colorful but still harmless?
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Most brightly colored *animals* are poisonous, but not plants. There are very different selective pressures here.
In animals, bright colors are a form of [aposematism,](https://en.wikipedia.org/wiki/Aposematism) or making itself conspicuous to predators as a warning that it is not safe to eat. Even that is not true in all cases; birds are often brightly colored but they are not poisonous.
In plants, bright colors are usually attractive signals to pollinators, like insects, birds, and bats.
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