Personally, I would just leave the stocking as is.
Blue gouramis can grow up to 5-6 inches, assuming we're talking about the 3-spotted and sort. And the pleco, well, they can get pretty big, to say the least. Therefore, I wouldn't add any fish.
But decorating is nice. You should let us know of the kind of set up you (substrate, lighting, filtration). If you have the urge to decorate and can't help yourself, I would just go with some fake plants. But if you want to put the time in and care, then real plants are an even better choice. I'm just worried the pleco might chew on it. But if you have a big plant, the 2 incher shouldn't do too much damage.
Hope that helped.