the size of the tank and what it looks like have nothing to do with each other
you could have a beautiful planted tank and an ugly, empty and mismatched 100gallon
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(or visa versa)
what you need to do is think of your restrictions
1) are you financially able to buy a larger tank
the bigger the tank, the more money you'll have to spend on parts/gravel/decorations/etc.
2) do you know what type of fish you would like to house?
-are you looking for colour?
-specific size?
-peacful fish?
-agressive fish?
-oddballs?
-graceful or goofy awkward/comical fish?
(keep in mind that the bigger the tank, the less restriction)
3) have you ever had a tank before? for less experianced people you may want to start off with a nice 20gallon... THEN move up to a 150gallon
if you can figure out more of what you want,
chances are we could give you a zillion great ideas
EDIT: if you still want to see some pics, then click on "MY SIG PICS" in yellow at the bottom of my reply where you will see my community and semi-aggressive 20 gallons
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