I prefer my background dark so light colorschemes are not really an area I've explored seriously. Also, dark colorschemes are much easier to design than light ones due to the disproportionate amount of light a white, say, background emits compared to the amount emitted by text. It dramatically reduces the number of colors you can use.

I have one here: https://github.com/romainl/vim-sweet16 but it is intentionally weird and essentially unmaintained.