If there is anyone who is really good at this and would be willing to help me, I'd be hugely grateful! You don't need to calculate number of tiles - I can do that - but just help me figure out a good design to use considering what I'm trying to do, which isn't even all that complicated (I think): Just white 4x4 or 6x6 square tiles possibly with some subway or smaller square tiles as accents and/or as a border row, plus a black or other color or glass accent line... somewhere. I'll get more specific and post pics if anyone volunteers to help.
If you're not up to helping with the tile design, I still have some other questions that I hope someone can still help me figure out:
1) I want places to put soap and shampoo that are both up high for when I'm showering, and down low for when I'm soaking. Do I have to do this on the ends (one high on the fixture/drain end, one low on the deep end) or would there be a way to make it work on the long wall? My main desire is to not have to turn completely around to get things if I'm soaking but I'm not sure how to make that work aesthetically. I'm probably going to use a prefab niche that can just be tiled into place (Click here to see what I mean).
2) Am I correct that with a very small bathroom, I need to be keeping the design as simple as possible?
3) Related to #2, would it be really off to do something like this in a bathroom that I'm trying to give at least a vague impression of a 1930s bathroom?

(Click here to see more pics of a bathroom that uses mosaic tiles in a somewhat similar way to what I have in mind, though I want to use square white tiles and probably a solid-color glass mosaic tile as the accent.
4) True or false: If I want to tile the shower first and then MAYBE tile all around the bathroom next year, the safest way to plan for that would be to frame the whole thing with a narrow border/edge tile all around, instead of ending it with rounded-edge versions of the tiles I'm using, so that I can later take off just the edge tiles where the wall tile meets the shower tile (and then continue the edging around the room).
FYI the floor will be black and white hex with probably a black (but maybe white) border, since I have not quite enough of the hex tile to fill the room (CS, yes, I'll hopefully FINALLY be installing that tile you gave me this summer!).