Well, this is something I like to do often.
When I try to make a playlist that is meant to be more than something to just be put on shuffle, I try to match songs of similar sound, genre, and theme. Then, I try to line them up in way that can carry a listener - tell a story.
I took the liberty of taking a screenshot of one such list I made called "DreamZone," partly after the last song in the list, but also because I designed it with the intent of tripping out.
I have a slight color association with songs. I'm not exactly sure why, and I'm fairly sure it's not synethesia, but I added the colors I associate to this picture, just to try to help illustrate what I mean by similar. I might be missing a few as I'm going off of memory with a few.
I think the text in the picture kind of explains the rest.
The first few songs introduce genres and most of the sound variety. It works out decently because they are all done by the same artist. Classical, rock, and DnB genres combine with epic, trippy, and space themes.
technically, this list also coincidentally works on loop, though not the best.
also, a few songs in the list are from traxinspace if you want to listen to it for yourself