Modern rustic: 12x24" porcelain tile made to resemble a wide piece of distressed wood. Not an overtly obvious wood grain, more of an implied grain that you only see after studying it for a minute. Rectified and small grout joint. (Form follows function in design- easy to live with is always first!) option B: a vein cut travertine patterned 12x24 in brown or gray tones. Set in a soldier corse, straight stack pattern, so it's not about the grout joints, it's more about the linear pattern of the tile.

nomadicmel - I would not consider removing the window at all - ventilation is so important, or you will give yourself even more problems, especially if you are having a dryer in there. Have you given consideration to where that will be vented anyway. If you are planning ahead for teenagers (and good luck with that) having a bath in one room and a shower in the other will be a very good investment, teenagers are anal about their privacy, but do be very mindful of storage - a vanity in the laundry will really be important - just somewhere to put a hair dryer for example.

Based on the plans you provided I would go with number 2 (top row - right) with everything on the right hand side, so you walk in the door and the room looks spacious and you are not looking directly at a toilet from your hallway. All the plumbing runs along one wall and that is always the cheapest option and you can have a heated towel rail or similar running along the wall next to the entry. If it is possible I would rehang the door so it opens to the right not the left and then I would swap the toilet and basin so the toilet is tucked behind the door (for a little more privacy) and the vanities will be next to the shower. Good Luck.

based on the accurate dimensions the most economical update would be to replace the spa with a shower over bath, keep the existing vanity and toilet, reuse existing taps and retile but, any bath renovation is always much more expensive than imagined, and the unexpected expenses (eg asbestos under tiles) can add up and a minimum of ten thousand for a very modest upgrade wouldn't be surprising...If the bathroom is in acceptable condition especially if there's any possibility of a future expansion towards the backyard that could affect the current position of bathroom and laundry) i suggest (subject to confirmation from a plumber) that you consider reorganising the other spaces and sacrifice the wiw to create an ensuite with linen storage taken off the middle bedroom..surprisingly an extra bathroom could be less expensive than renovating the old one but i would still allow at least $10,000 with careful planning