The blue color morphs of dwarf gouramies are usualy called 'neon blue' or 'powder blue'.
Plain 'blue' usualy reffers to three-spots (trichogaster trichopterus) like the one in that picture. here are some more: http/www.theaquarians.net/FishPhotos/Blue%20Gourami.jpg
Note BTW that this is not the same as the 'wild' color. Though this 'blue' version of the three-spot is the closest you get to the wild form, it has been selectively bred to be blue-er and the wild fish has a lot more gold/yellow and green tinting the blue. The clean, silver-blue color you see in that picture has only been achieved by breeding for many generations.