You can easily generate a number of random images with ImageMagick and serve these as part of the babbled text. And you could even add text onto these images so image analyzers with OCR will have "fun" too.

Example code:

   for c in aqua blue green yellow ; do
      for w in hello world huba hop ; do
         magick -size 1024x768 xc:$c -gravity center -annotate 0 $w /tmp/$w-$c.jpeg
      done
   done

Do this in a loop for all colors known to the web and for a number of words from a text corpus, and voila, ... ;-)

Edit: added example