I thought every euro coin looks the same, interesting

The euro coins have a “European side” that is the combining factor and a “national side” that is designed by the member states themselves.

Most coins aren’t that interesting - www.muenzen.eu/euromuenzen-rueckseiten.html

Euromünzen - Alle nationalen Rückseiten - Muenzen.eu

Zusammenstellung aller nationalen Rückseiten der Euromünzen - sortiert nach den Ausgabeländern und mit allen verschiedenen Motiven.

That’s a cool site. Apparently 2 out of 9 coins in my pocket are German. German coins are actually so common I thought they were the default design and didn’t belong to a country.
Iirc about 30% of Euro coins are German. There’s a lot of transit traffic going through the country and Germans love travelling which helps spreading the coins.