Thanks, Purple Lady. A single background texture won't do it for me. I remember that "Wood" texture from FBReader, and thought it looked weird,

just like you described it. Anyway, I prefer using my own custom background textures, although I'm also particularly delighted by one of those provided by Moon+ (see the first, day-mode screenshot posted
on the previous page).
By the way, there is
one feature that lacks customisation in Moon+, too: the size of the first-line indent. You can currently only choose "yes or no", but the current size of the first-line indent in Moon+ is too big for my taste. I wrote to Moon+ developer to request to make that size customisable, but no luck so far.
As to data in the footer, I couldn't agree more!

The best e-reader I know is Marvin on iOS, and I've just been battling very hard for months now, trying to persuade Marvin's developer to make the data in the footer fully customisable (see
here). Again, no luck so far, but I hope the Marvin footer will one day be fully customisable.
I happen to find Moon's footer close to ideal for my purposes, but that's just me. Other users may feel differently. You'd like to see "pages left in chapter", someone else might prefer to see "pages left in book", while I myself would prefer to see
both in the footer: "pages left in chapter"
and "pages left in book". Both Moon+ and Marvin currently only display the former.
And, for either option, there are various ways to state the page information... It can be "page 8 of 19", or "11 pages to go", etc. The percentage of book read can be 71%, or 71.4%, or 71.43%. (I've seen various e-readers employing each of the 3 options.)
The options and potential user preferences for data displayed in the footer are endless, and I believe that quality e-reader software should strive to cater to every user's wishes in this regard.
Make the data in the footer fully user-customisable using placeholders. Issue closed!