Ahh, the detail. I'm still working on getting the Total Population map done by block group, as well. But this one just sorta fell into place a bit quicker, so here's CVAP for ya. The side-by-side thing is also updated with CVAP-BG maps. Again, the color-coding is as follows:
Red: Anglo share over 50%
Black: Afr.-Am. share over 50%
Orange: Hispanic share over 50%
Yellow: Multicultural. ie - everything else
Generally, Multicultural is where no demographic group has a majority. There are some small areas where there is an Asian majority, but they're not necessarily enough to show up in a map zoomed out to any degree.