There is a simple exercise in repainting using the Chicago Fun Blimp which can be downloaded from this site. MSPaint can be used for the repainting so don't expect miracles like gradient colour etc but as an introduction in understanding what is behind repainting it is very good.
All the instructions are in the readme file. Thanks to Wm R Pulick the author.
Here is an example of what can be done -
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...OK - it won't win any art prizes but it's all my own work 😉
That's very cool, you certainly like to experiment. You must be very pleased with yourself, I'm impressed.