I like that last photo, but we framed our door so as to have enough space for a single 36" door off to one side and now do not really have enough room for an 18" off to the left. The main reason was that in our house, a door slid to the right, left open a lot of the time, is pretty out of the way, but an 18" door to the left sort of gets in the way of a high-traffic mudroom area.

Only 24” deep and only a 36” opening are big fails. Completely undoable. You won’t be able to access anything. People take up a 30” circle. You don’t have a walk in pantry. You have at most, a step in. A step in needs the widest possible bifold doors. Or, shudder, barn doors.

We converted a powder room to a pantry and installed a pocket door with etched glass panels (actually like a green frosted glass - closer to elunia's first picture). It's a highlight of the kitchen - elegant when closed (usually when we have company over) and it disappears when open - which is most of the time. Also, it glows nicely if you leave the pantry light on. So TL;DR - I heartily endorse frosted glass.

Appreciate the input GreenDesigns. This was the largest possible footprint for the pantry, so it was this, or smaller. It is indeed a step-in pantry, not a walk-in.

It will be a step-in U-shaped pantry. There will be 12" deep counter up each sidewall (more like 24" deep on the right hand side so we have deep storage for paper towels or small appliances). The 12" deep counter will run across the back of the pantry as well. Below will be 12" deep shelving and above will be 6 or 8" deep shelving.

We could have made the door the full width of the pantry and made it just a reach-in but I think the bifold doors would be annoying/in the way (we have them on our laundry) and we would have no wall space then on which to slide a sliding door.

Contrary to your statement that we wont be able to access anything we are looking forward to how accessible everything will be relative to our old pantry.

How can we decide on the door style when we have no clue what the kitchen or the rest of your house looks like?

You could ask? We have a colonial house. All interior doors are colonial 6-panel except for the french doors we have between our living room and kitchen. Here is a rendering of the kitchen.
In this rendering the pantry is shown with double ~18" doors (white with glass) at the far end of the room)

Kitchen will have light green shaker cabinets, quartz counters around the outside and butcher block on the island. Paint/trim for the kitchen and mudroom/hall area (where the pantry is) are TBD. Inside the pantry the shelving will probably be green to match the kitchen cabinets with the wood "counter" stained close to the color of the island top. Door color could be similar to island top or more likely hall trim color (which should be complimentary to the kitchen color) or same color as kitchen cabinets.

Let me know if there is any other information you would find helpful

Is your kitchen closed off from the rest of the house? If not I need to see pictures of what the rooms surrounding the kitchen will look like. Design isn't taking one thing adding it and then trying to find something else.

Each design element you have (color, fabrics, textures, flooring, tile, wood choices, furniture, lighting, etc) all affects the other choices.

For example, since my kitchen is seen from the friends' entry and from my living room and dining room, when I started to design the kitchen, I also made sure to design the surrounding spaces so they all worked together.

So show me photographs of what the other spaces look like or if this is a new build, what you want them to look like.

I could say I love door style 3 but if it has no relationship to what you're planning with the rest of the rooms, it's going to look like a fish out of water in your space.

I actually have a separate thread looking for input on the larger space (connected living room and kitchen wall and trim colors/layout etc). Feel free to jump in.

https://www.houzz.com/discussions/5692559/need-wall-and-trim-colors-for-kitchen-living-room