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Maybe a dark-ish themed one with a more chilling background. That affect can be achieved by using more/less saturation in your textures, and adding a sort of "moisture"-ish ambience and sounds for walking, breaking, or scrolling over blocks, etc. I personally think that giving it recolors with a "not-so-vibrant" recolor of neon-ish colors will add a better experience for multiple players who prefer some colors more than others. Examples of colors include: Red and Black (my fave), Blue and Green, Purple and Pink, Baby Blue and Baby Pink with White, Black and Gold, Black and White, Green and Black, Purple and Black, Pink and Black, and multiple other variations! Yeah, that is a lot of work. But trust me, more players will be willing to download your packs!
Edit: Turns out you have already followed a similar narrative!