5 gallon tank= a good betta tank with live plants. Your betta will display beautiful swimming, flaring and exploring behavior in these larger tanks that you may not see when they are kept in smaller habitats.
Print any picture you want, spray paint a piece of wood black. Cut the picture to the size of the wood, using Mod Podge coat the wood lay picture on the wood, even out. Sand the edges. Then put a layer of Mod Podge over the picture.