Today I tweaked the font color on the new "Radiant" themes to:
(1) make the color of the top bar a little less "radiant" - toning it down from effectively neon to a little darker, and
(2) made the color of the text in the main body of the website a little brighter, and less subdued and therefore (hopefully) easier to read.
If anyone sees any problem with those changes or would prefer further tweaking please let me know!