Maybe the Netherlands would have been more harshly punished if Napoleon hadn't deposed Louis, and the nation had remained an ally rather than a province?
Indonesia was a complicated thing, and still is! It was nothing like the 20th century swathe of Dutch territory as Britain still had lands in Sumatra, Aceh was independent, Portugal had greater claims that were still pushed etc. Add to that, of course, British occupation of the other important places in the war, and you could set it up so that post-war the Netherlands lose it all. Britain and Portugal would be the imperial winners here.
Now, during the 19th century the Dutch and Danes sold their West African possessions to Britain, and the Danes also ceded islands in the Bay of Bengal to them. However, both the Netherlands and Denmark continued to own islands in the Caribbean. Denmark would lose theirs in the First World War when the US forcibly purchased them. The Netherlands of course has them to do this day.
Sweden was gifted Saint Barts but later sold it to France after its capital Gustavia was wrecked in a hurricaine and Sweden didn't want to bear the cost of repair. It would be reasonably easy I would think not to have them given the island in the first place, perhaps simply given more money.
Germany and Italy obviously only got into the colonisation game after unification - you could retard this, have it happen differently or not at all, or simply have events play out differently, especially where Germany is concerned. Italy OTL lost out in Tunis and was furious, but they could have remained furious and unsuccessful - their next colonial adventures were defeat by the Abyssinians, and rebuff by the Chinese. Only in defeating the Ottomans in 1911 did they gain modern Libya, and the Dodecanese.
US imperialism probably has its most successful roots in Hawaii. Have Hawaii become an official British protectorate and the US won't get a foothold there. WIthout it, the distance to the Philippines seems much larger. If the Maine doesn't blow up, there might not be a Spanish-American War at all, so Cuba, Puerto Rico, the Philippines etc remain Spanish, or battle for their independence at some date.
Arguably Russia is no more a colonial power in conquering Central Asia than the USA was in spreading West over the Indian lands, and taking land off Mexico, or the Ottoman Empire was in their conquests of Egypt or the Balkans. You can say these are imperialism as in empire-building, but not colonialism per se, certainly not in the modern sense.