i would assemble and frame collages of same type items and hang the framed collection.

Pasteing anything to the walls will be a nightmare to remove when you want to.

It is often a fun look to intersperse smaller, less formal items in between the larger framed pieces. A small " invitation" can be hung with straight pins, etc. these kinds of things give it personality and keep it from being " stiff". Lay it out on the floor and rearrange from there.

Could you post a pic of the things and get input from the talented folks on here?

I would mostly frame things individually or in 2's and 3's. then hang and put things that don't need frames in between. I think for the "lots of stuff" look you want, you want the collection to appear like it just grew and you framed each piece as you found it and hung on your walls

I can't offer any ideas, but I love the plan and can't wait to see the finished room!

What color are the walls?

I'll have to get everything out and get organized to get some pictures. One of my issues is that the towel and tp holders are sort of in the middle of the walls. I honestly don't have the energy to have them moved and the walls patched. They went up at the very end of a looong renovation and at that point (after having them moved once and still not correct) I just wanted the guys out of the house. Now it makes for an awkward area to hang things around.

Walls and trim are the same color, a soft tan from F&B, the name escapes me at the moment. Floors are slate. Hardware and sconces are a blackened iron, early colonial style. The powder room opens into our mudroom in the same colors/style.

In my last home I did my powder room with an English library sort of 'vibe'. The walls were a deep red(Balmoral Red/Ralph Lauren),and I used pictures, small mirrors, corbels, plates, etc. from ceiling to baseboard. All frames were very ornate and were either gold or black/ gold. If you have a standard builders grade mirror, get rid of it or add a heafty frame, which is what I did, or remove the mirror and use a decorative hanging mirror, not necessarily intended for a bathroom. I also hung a small narrow shelf directly in front of 'the loo' which held small vintage books, since I thought it would add to that English library look I was going for. When I put the home on the market to sell, instead of a negative, it was a hit! I did leave the little shelf since the new owner wanted to re-create the look.

I like Nosoccermom's pictures with the large elements; the one with small elements looks too...busy? Might keep people in there too long looking at everything lol!