Hair Colors Ideas

I'm being Thing 1 for Halloween and I think this hair would be perfect. Is it possible to recreate this with temporary blue hair-dye from a costume store? If you know, could you tell me how, like whether to mix it with conditioner to make it lighter or something? Thanks :)

this is beautiful! can you tell me how to do this? ^.^

so whimsical and fun; its like a dream :) do u use blue in conditioner to soften color to make it that pastel?