when you say into the window, do you just mean the Ledge/Shelf?

Sounds like you will have a fairly dark finished product with the cabinets and floor in your forest green and matte black.

I'd choose a light, White tile. Subway, yes, inexpensive choice, not too complicated tiling process.

Can you get a solid stone for the Shelf/ledge, for a smooth finish? Tiling a 'countertop service creates all kinds of issues with grout, seams, etc.

If not, I'd go with a bullnosed wood shelf, for a clean finish. How much of the wall will you tile? all the way to the ceiling? or are you installing upper cabinets?

Anyway to can make the upper cabinets white with just the lowers green?

alot of dark cabinetry will make for a very dark kitchen. Where are those leaves coming from?

lights in the soffit?

thank you! and yes i meant into window ledge/nook. i dont understand what youre saying about the countertop creating issues with grout/seems? Id like to just do shelves instead of upper cabinets. the kitchen overall is funky shaped and small so hoped shelves would give it a larger feeling. i hadnt decided how much to tile, to the ceiling or just a backsplash i was really hoping to get someone elses opinion bc im struggling to see what would look best with the odd shaped window nook. Also the leaves are just a hanging plant. thank you again!

a head on photo would help. Looking straight at the window.

you are tiling the window wall AND the left side wall (is that where you want open shelves?)

Are those the counters?

(I think @Lyn Neilson means the shelf behind the counter, below the windows and is suggesting that should not be tiled. )

I thought of this kitchen when I saw yours. I think a short splash (4_ 6") of honed black granite with veining (Virginia Mist type) or even better a green-toned soapstone, behind the counter and including the ledge area, would be perfect. You have plenty of light hitting that area to pull this dark look off, I think, if you like the look.

See more of this kitchen here: https://www.remodelista.com/posts/brian-persico-hannah-haworth-catskills-kitchen-color-palette-paint/

Picture from the opposite side if it helps. i love the picture @barncatz shared and thats so spot on with the style. the window area is just confusing for me bc the one side is boxed in where the other side isnt and the window area just runs into the regular wall so i was hoping for opinion on to stop before the ”window nook” (wall) or should i tile up to the window? this is what they had before but i feel like it wont look nice. also i like the idea of a darker backsplash but was worried about the whole kitchen being too dark so my brain was defaulting to white subway tile but then i was worried that might look out of place in the dark kitchen style im going for. for shelving i was thinking the wall in the first photo from the original post. also wasnt sure how that would look. would it look akward next to the large triple window?

I would put white penny tiles in the space between the sink counter and the window ledge. Then, paint the rest of the walls. The side walls do not need tile...