\starttext

    \setupbackgrounds[page][background=color,backgroundcolor=red]
    \input tufte
    \page
    \setupbackgrounds[page][background=,backgroundcolor=]
    \input tufte
    \page
    \setupbackgrounds[page][background=color,backgroundcolor=red]
    \input tufte
    \page
    \pushbackground[page]
        \setupbackgrounds[page][background=color,backgroundcolor=green]
        \input tufte
        \page
    \popbackground
    \input tufte
    \page

\stoptext
