Tried doing something limited to the rendering limitations and pallet limitations of the NES. This image is a 4x4 square of 8x8 sprites and uses two pallet swatches. The pallet swatches are (0x28, 0x29, 0x0F) and (0x29, 0x17, 0x0F) in the NES. The background is white for contrast but really it would be transparent since that is a color which is always available internally even if it's not in your pallet.