Personally, I wouldn't mind if the ef-themes were added, I'm just not sure about the large-to-me number of options available. I guess a lot of people have that problem.
I did also notice that the ef-themes don't have any descriptions when using (M-x customize-themes). They simply come up like the below:
==== example buffer ====
...
[ ] ef-summer -- (no description)
...
If the individual themes are loaded with M-x ef-themes-select, then their description does turn up in the customize-themes listing for each theme loaded (and presumably then cached), shown below:
==== example buffer ====
...
[x] ef-summer -- Legible light theme with magenta, purple, gold, cyan colors.
...
I don't know whether I failed to follow some installation instructions when I installed them.
Just my NZ$0.02
Regards, brickviking