FearLights_Mathematica.txt

req = HTTPRequest[
   "http://api.thingspeak.com/channels/1417/field/2/last.json"];
f[] := (
  colour = Brown;
  reqStat = Quiet[ URLRead[ req, TimeConstraint -> 2]];
  If[ Not[FailureQ[reqStat]],
   ( rawData = Import[req];
    colour = RGBColor[Lookup[ rawData, "field2"]]; )
   ];
  colour
  )

(* jack-o-latern CCby4.0 Vincent Le Moign from
https://commons.wikimedia.org/wiki/File:659-jack-o-lantern.svg *)
jack = ResourceFunction["SVGImport"][
   StringJoin[NotebookDirectory[], "jack-o-lantern.svg"]];
backdrop[] := ( 
  LinearGradientImage[{Bottom, Top} -> {Evaluate[f[]], Black}, {50, 
    50}])
eyes[] := ( Graphics[{Evaluate[f[]], Disk[{15.5, 28}, 2.7], Disk[{32.5, 28}, 2.7]}] )

draw[] := (  
  Show[ backdrop[], jack, eyes[], ImageSize -> {400, 400}]) 

CreateDocument[ Dynamic[ draw[], UpdateInterval -> 10] ] ;

jack-o-lantern.svg

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NB you need to copy and paste this into Mathematica it is not a .nb notebook.
NB 2 it should work with Wolfram Engine/Mathematica free on the Raspberry PI but I have not tested it.