On Thu, 16 Jun 2016, Alan BRASLAU wrote:

> On Thu, 16 Jun 2016 18:18:58 -0400
> Aditya Mahajan <adityam@umich.edu> wrote:
>
>> And some stage, it will be nice to discuss the possiblility of adding
>> background to formulas, especially aligned formulas.
>
> something like a
>
> \setupformula
>  [before={\startframedtext[background=color,backgroundcolor=lightblue]},
>   after={\stopframedtext}]

One typically wants to have a bounding box around the displayed math, but 
not the white space or the equation number. For example, see the attached 
image.

Aditya