Replacing your pedestal sink with a vanity would give you more counter space as well as cabinet space for closed storage. If you can, I would recommend doing this to easily and aesthetically increase the storage in this bathroom.

I like the floating shelves idea. Baskets are nice on shelves for storage and appearance.

I have a space-saver cabinet from Bed Bath and Beyond that fits around the toilet and hides quite a lot of stuff on the 2 shelves behind the doors, plus the top of the unit and a shelf over the toilet, and room for a tray on top of the toilet. It took a long time to assemble but it's very stable once it's loaded down with stuff. You could easily switch out the knobs if you want. I left off the plastic bar on the back wall, and instead papered it with something to co-ordinate with the room. It was a good investment for 80 bucks. It comes in a dark finish as well. I did not bother with the little plastic divots that are supposed to hide the screws.

No room for vanity. There is floor vent on wall. Leaves a tiny space between that and toilet.

Floating selfs look nice

The cabinet is all open from the toilet down, except the narrow supports. P.s. To make up for the lost towel bar, I put up some door handles near the tub.

Look at hardware store for wire racks to screw on inside door of linen closet. About $12 each. Installed 3 racks with 2 shelves each and now have about 35 bottles and boxes conveniently stored out of sight.