Not sure if this is an pointless submission considering it's only 4 blocks, if so then feel free to remove it. (Even if it's your job : P)
Anyways even for being 4 blocks I think these replace more color space than it should; 2 blocks take up almost one whole palette row while the other 2 take up another. Those 2 palettes being palette 2 and 4. But considering these'll probably only be used for bonus's I didn't worry too much.
With that said these are handmade so I'd like credit and I hope you can find a good use for these!