Hi Pablo,
for each defined colour there is a command that can be called to
switch. \centerbox centres the text vertically. It is not the most
elegant solution, but the following does what you asked for.
\setuppapersize
[S6] [S6]
\setuppagenumber
[state=stop]
\setupbackgrounds
[page] [background=color]
\define[1]\setpagecolor
{\setupbackgrounds[page][backgroundcolor=#1]}
\setupalign
[middle]
\starttext
\setpagecolor{blue}
\yellow
\centerbox{Page is blue and text is yellow.}
\stoptext
Marco
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