I'm not the amazing Hemera who is the moderator of this area but you are asking for a spread for your past dreams and I think this is exactly the right place
There is an index of spreads and if you look on this page here
you can see all the dream ones indexed. I recommend the simple dream decoding spread, you can add more cards / positions to it if you like.
This is the page for it here
1. What was it all about?
This card shows what did actually happen in the dream, what the whole story was about.
2. Why did you see it in a dream?
This card indicates the situation in your real life which could produce that dream.
3. What was that dream for?
This card contains some wisdom your unconsciousness try to tell you about the situation recognized by the card 2.
4. The practical advice.
This card tells what you must practically do to resolve the problem.
You can add more cards to each position, like 2 for each to get more info or you can add your own positions to the 4. But it's my fave dream spread for working it out!
hope you can work out those past dreams
ETA: we cross posted, glad you found the index!