Good tank for betta fish?

i've decided to only keep my fish i have now instead of buying a 5 gallon and more fish. i'm probably going to buy this: a href="http://www.petco.com/product/8280/PETCO-2-Gallon-Hexagon-Mini-Fresh-Water-Aquarium.aspx" rel="nofollow"http://www.petco.com/product/8280/PETCO-…/a so what do you think about it for one male betta? also, whats some nice colored gravel or stones or something of the sort i can put on the bottom? and a nice looking plant? my fish is black, burgundy, and blue. thanks!