Pedestal sink storage solution:
Install a sink with a framework below that allows towels to hang from.
This style of sink also allows for more counter space for soap dispenser or decor items around the sink,
If you already have a sink in place, you can still have storage under with baskets, corner shelving from Ikea, narrow shelf unit beside and or make use of the walls. Shallow wall shelves can not only be for storage and keeping the bathroom organized but they can be as decor too.