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Could it be George Shrinks?
Were they shorts between episodes or full one 11-22 minute episodes? Where did you watch it?
Also "better drawn" than Frederic Back's "The Man Who planted Trees"?! Have some respect for a classic by a MASTER! :p
Automaton 120: Thank you, but it's not the one.
undrave: Not sure about the length, maybe 10-20 minutes. It was aired on a Hungarian tv-channel
Date: 15-20+ years old.
Country of origin: Unknown, probably western animation.
The drawing was artistic. In each episode the kid discovers and enters tiny worlds around him. Once he studies his ice cream up close and notices tiny eskimo-like people in it and soon he finds himself among them. Another time, as he lays in the bathtub, he checks his knees and realizes that they are islands for tiny people, sailing on boats, in the tub. One more is when he's cracking open a hard boiled egg and again, finds a tiny world inside, gets transported there, has adventures with it's inhabitants. This was the structure of every episode.
It's not the Once Upon a Time series or The Littles.
The color scheme was similar to that of this cartoon: https://vimeo.com/28238967
And the drawing style was similar to that of this cartoon except what I'm looking for was a bit better drawn:
https://youtu.be/1C8sh7y7RDM