I am 50% Czech and these eggs, or similar, were made by my ancestors. Here is Wiki on pysanka
Many other eastern European ethnic groups decorate eggs using wax resist for Easter. These include the Belarusians (пісанка, pisanka), Bulgarians (писано яйце, pisano yaytse),Croats (pisanica), Czechs (kraslice), Hungarians (hímestojás), Lithuanians (margutis), Poles (pisanka), Romanians (ouă vopsite, incondeiate or impistrite), Serbs (pisanica),Slovaks (kraslica), Slovenes (pisanica, pirhi or remenke) and Sorbs (jejka pisać).
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If you have never had an Ukrainian Easter, I cannot describe what you have missed.
The "Church ladies" made drop-dead gorgeous pysanky. I have never made those, but I have made many, many perogies.