I’ll just mention three for now.
Made by @kmeb way back in 2012, based off a doodle she did over a photo of cottonballs. Not as common now.
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@Muffin 's own unique take on Micros as a eusocial creature, much like ants and naked mole rats.
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Garden fluffies are a tough one. Originally, garden fluffies as @kmeb depicted them were really large earth fluffies that had earth collected in their fluff, which allowed plants to grown on their backs. Somehow, this design slowly morphed into a half plant/half fluffy chimera which was drawn by some later artists. @Carpdime himself drew some plant-based fluffies.