It's difficult to
aquascape someone's tank if you don't have a pic, so I won't touch on that.
Along the lines of gouramis: they arw a very varied group of Labyrinth fish (fish that have an organ that they can use to take oxygene from our air) that are popular in aquaria. Their temperment is highly debated among aquarists - it is best to keep either a male with 2 females or a male alone. They come in all sizes, from 6-70cm! For a 10gal, you could have Dwarf gouramis, Honey gouramis or Sparkling gouramis.