not much of anything

anything goes

There are no rules or restrictions.

if anything

Used to suggest or state tentatively that something may be the case (often the opposite of something previously implied).

much ado about nothing

A lot of fuss or bother about something trivial.

much of a muchness

Of two or more things, having little difference of any significance between them.

protest too much

To insist so passionately about something that people suspect the opposite of what one is saying.

so much for

An expression of dismissiveness, disappointment, disregard, or resignation; something said upon rejecting, giving up on, quitting, or disposing of something.