One of the best ways to neutralize a pastel greenish blue is to use complementary colors. Complementary colors are colors that are opposite of one another in the color wheel. For this pastel greenish blue, the complementary color would be a pinkish-orange. You could add some oranges and pinks to the space to neutralize the natural greens and blues of the area.
In addition to using complementary colors, you could also add some warm colors, such as yellow, to the space. The yellow can help to counterbalance the cooler colors of the greenish-blue, creating a more neutralize effect overall.
You can also experiment with combining different textures to neutralize the pastel greenish blue. For example, introducing a variety of fabrics and textures, such as textured rugs, pillows and curtains, can help create a feeling of warmth and comfort. The textures can also help to detract from the greenish-blue and create a more neutral environment.
Neutralizing a pastel greenish blue can require some creativity, but the effort can pay off in the end. By using the tips outlined above, you can create a more balanced and tranquil atmosphere for your space.