Of the backgrounds you have shown, I like the dark one the best. It looks like a nighttime sky and shows off the little houses. The light backgrounds compete with the houses and it all sort of blends together. I like the suggestion of the trees between them, too.

I love what you're doing with Kaffe fabrics! I have tons and am sometimes stumped as to what to make but I do love his fabrics.

I whipped up a bunch of idea spacers yesterday at quilt group, I'll offer them up for suggestions in a little bit.
The 9 patches from the leaders and enders was total fail, so different it was like what would happen is you sewed a banana to an orange :) black and white ones would probably work though were I inclined to make them.

thank you for helping me see.

Maybe set the houses in rows - with fabric representing roads or beaches or mountains between the rows.

It will be sort of a flat grandma Moses type of presentation.

Or could have backgrounds representing different times of day.

The separating would be horizontal.

Or make a housing development o one t with the blocks.

I'm not sure how big the blocks are, but you could make them into bird houses by adding an appliqued hole. Then maybe add bird blocks in between. You could put some on poles to shake it up a bit and elongate the blocks. Just a thought...my mind sees things weirdly sometimes.

the blocks are 3" finished.
today's experiments.
thinking if I keep the trees change the background to match the spacer blocks.
Any houses going forward should have neutral to light blue sky.

my original thought was just houses in rows. I'm thinking I'm losing sight of simple which was my first intent :)
haven't tried offset yet,

I like the one with white background a lot! And I see you have some of the same Kaffe fabrics I have.

I think we all do Dunster, some of his are timeless that mix in with some of his new ones.
My Kaffe scraps came from doing an Escher quilt from Quiltageous kit in 2020.

I've got a new layout today, I decided the trees didn't add anything so have moved them to a border, and I ripped the dark roofs off last night and will use them as some kind of border. I didn't mean this to become a thoughtful quilt :) I just wanted to make houses, but apparently it is destined to be one of my 40x40"ish quilts for the loft rail.

photos to follow, I'm booking our fall travel months RV reservations now. Last year we traveled for Rob so this year we are hitting the International Quilt museum in Lincoln, Missouri Star (only took me 4 hours to go through 6 years ago, but now they have a little RV park and maybe I'll get a chance to talk to sister sewers.) and Shipshawana for a week. Life is good if we allow it...

ok, this is were I am at quitin' timetoday, that border is either trees with wide stumps or tall houses :) I thought I had a corner beam ruler for the corners but maybe I sold it. Maybe I can wing it..

I like your white background best. I think either of your border ideas would work. My pick would be the pyramid triangles or the tree one without the stumps in between or maybe the diamond blocks instead.