First, here's something that nobody tells you about until it is two late: Aquariums are addictive. Even in college. I started with a betta in a 1 gallon bowl that surprisingly survived his first year in questionable water conditions until I upgraded to a minibow 2.5. Small aquariums with heaters and filters really aren't all that expensive or hard to maintain, and any fish would be more active and healthier. The Eclipse systems can be a little pricey for the larger ones, but for a 6 gallon Eclipse, you'd spend just as much on a smaller acryllic aquarium that you have to add a heater to. In good water conditions and temperature, bettas and african dwarf frogs can be extremely amusing to watch, and some smaller pet stores sell some really amazing varieties of bettas that you just don't tend to see at a place like walmart or petsmart. Also, with an aquarium with a hood, you will be able to see your fish so much better than you would if they were in a bowl. Dwarf puffers are very cute little guys, as are the african dwarf frogs and bettas, (check out a store that tends to specialize in fish rather than dabble in everything for some awesome looking fish) but if you are determined to stay with a no filter no heater bowl, you should probably stick to the first suggestion from Raskolnikov - fake fish. At least those won't ever go belly-up on you.