Decorate your aquarium with a Super Mario Brothers theme! Use Legos to construct the hanging planks, stairway, flag pole and tower. Cut the ends off PVC pipes and use Legos to make Mario and other characters. Spray paint all structures with a white base coat, paint and decorate the structures and coat the aquarium decorations in clear enamel or aquarium sealant. Attach the hanging planks on clear tubes, draw and color a sheet of poster board for the aquarium background and find the desired color of gravel. Cut holes in a straw and attach the straw on an air tube to make a bubble dispenser for the tower.
Source: Damn Geeky