The bug
Particles created by entities in water appear to reflect the old blue water present in pre-1.13, rather than the new colors of water found in 1.13 onwards, due to them not being affected by biome pigmentation like water itself is. This bug was fixed for block breaking/landing/etc.-type particles (see MC-29544), so a fix should be fairly simple.
Rain textures and particles could probably be left as-is (or changed to fit the new default water colour).
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Could be considered to be affecting 1.12.2 as well, due to swamp water.

Affects 1.13-pre4.

Still in 1.16rc1

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Attached are some grayscale versions of the current particle textures, which can be tinted accordingly without the blue getting in the way.

This is a feature request.
Would it be okay to request a review of this ticket?
Since MC-29544 was considered valid (and was later fixed), it seems quite strange for this similar concept not to apply to splash, bubble, and dripping particles. I feel that this is a problem because, for example, take a swamp biome. Swamps consist of desaturated and moody colors which reflect their environment to be quite deceased, and having particles that are rich in color being displayed here, kind of takes the atmosphere of the biome away. We stereotypically associate vibrant colors with motion, energy, and alacrity, and having them produced in a neglected environment suggests liveliness, which ultimately takes the feeling of the swamp away, as the biome is meant to be an overgrown and forsaken place.
To further reiterate this point, take a look at the attachment I've provided below. As you can see it's dark, raining, and wet in a swamp biome, and having some brightly colored particles being produced in this desaturated setting feels rather strange.
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This is a feature request.