IOTL Tuscany sponsored an expedtion to found a colony in what's not French Guiana to further explore the region and export Brazilian wood back to Italy, the only reason it did'nt go through is that in the time between the expedition setting out and returning the Grand Duke had died and the new one had no interest in the project.
Pieces of information like the above are fascinating. Please dump here other colonization projects that were aborted (or failed or were really short-lived) by states that otherwise never really had a colonial empire.
A few wiki articles to get this started:
- On some German principalities' attempts;
- The Wikipedia list of colonial empires includes some really short-lived ones like Austria's or Courland's;
- The above list fails to mention pre-union Scotland's ventures in the Americas.