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Or better yet, allow custom style of background and border (border is less 
critical, <div> can be used).

A transparent background by itself is no good because the background color might
then make the black text unreadable (black-on-black or some other dark color). 
See brion's WONTFIXing of bug 6413.  If the image itself were made transparent
*but* img.tex { background-color: white; } were set in the stylesheet, however,
that would seem to be a good solution.  You could then specifically override it
on enwiki, say, for non-article space.

Of course, courtesy of IE, the borders of the characters would still have to be
antialiased to white, so it would still look a bit ugly.  But hey, you can
always leave the background white if you prefer it the current way.

This is probably a dupe; if you find it reopen and dupe this bug.

Well in our wiki it is not such a big of a deal because our pages are white. I 
encountered this issue when entering a <math> png in a table with a colored bgcolor. 
But what about the wikis that have colored pages? 

I have no idea how the <math> png works, but the but be a way to make the bgcolor 
all in the same color. I obviously have no experience, but perhaps svg, not png, 
should be used, and then maybe you can "color" problematic character borders. Or 
maybe not, you are the tech guys.

I guess I'll just change the bgcolor of my table to white when using <math>.

*** This bug has been marked as a duplicate of 8 ***