John,
I did this to simulate a picture frame. Looking at it now I am sure it could
be simplified.
\setupoutput[pdftex]
\setupcolors[state=start]
\startreusableMPgraphic{bg}
StartPage ;
z11 = ulcorner Page ;
z12 = urcorner Page ;
z13 = lrcorner Page ;
z14 = llcorner Page ;
z91 = (-1, 1.414) ;
z92 = ( 1, 1.414) ;
z93 = ( 1,-1.414) ;
z94 = (-1,-1.414) ;
z21 = z11 - 16z91 ;
z22 = z12 - 16z92 ;
z23 = z13 - 16z93 ;
z24 = z14 - 16z94 ;
z31 = z21 - 6z91 ;
z32 = z22 - 6z92 ;
z33 = z23 - 6z93 ;
z34 = z24 - 6z94 ;
fill z11--z12--z13--z14--z11--z21--z24--z23--z22--z21--cycle withcolor
yellow ;
fill z21--z22--z32--z31--cycle withcolor .9white ;
fill z22--z23--z33--z32--cycle withcolor .8white ;
fill z23--z24--z34--z33--cycle withcolor .9white ;
fill z24--z21--z31--z34--cycle withcolor .8white ;
StopPage ;
\stopreusableMPgraphic
\defineoverlay
[bg]
[\reuseMPgraphic{bg}]
\setupbackgrounds
[page]
[background={bg}]
\starttext
\dorecurse{3}{\input knuth}
\stoptext
--
Nigel
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