What would be a good paint finish in a bathroom with old plastered and new drywall mixed together?

The surface is quite rough despite lots of plastering and sanding. The room is done is blues and aquas, spa-like. I'm thinking of something that might suggest water. Any ideas?What would be a good paint finish in a bathroom with old plastered and new drywall mixed together?
Several different faux finishes are very good at disguising imperfect walls.





Color washing and sponge painting are two very good techniques for this, as the textured look of the finish camoflages rough or irregular surfaces.





I love the suede paint look and technique, but I would not at all suggest the technique for use in a bathroom. It is not an exceptionally durable paint...it scratches easily and does not hold up well to moisture.





You can find instructions for the color washing and sponge painting techniques at the site below.What would be a good paint finish in a bathroom with old plastered and new drywall mixed together?
GET TEXTURE PAINT AND HAVE A PALE PALE SHADE OF ICE BLUE....
With dissimilar surfaces, you should really consider making an attempt to make them more similar. While it is a lot of work to plaster the drywall, it may be the only way to make the room look entirely uniform. However, if you are able to achieve a similar texture on both sets of walls, then you should still consider using a latex primer coat (preferrably two) on each wall to ensure that the paint adheres similarly. This will also help to ensure that the sheen is similar on both surfaces.
I would go with a faux finish of some type so that the roughness looks as though it were intentional. You can do a suede look and it's relatively inexpensive. Good luck!
Bathrooms should always have either a satin or semi-gloss finish on the walls. It will take the steam better than an eggshell or a latex.