Oh I see! I watched the video in the integrated player here in the forum, so, I did not see the description, just read it now. 4x1 blocks seem like a very good idea. I used 2x2 blocks in Tales of Popolon just to make them blend with the 2x-size resolution sprites. But 4x1 seems like it can get quite interesting results!
Good point about only having to update the color table, I had not thought of that! There might be implications of having a pixel-by-pixel vertical resolution, but it will probably result in a net speed up compared to 2x2 blocks. Very cool idea!