If you had a 300 gallon aquarium.......

Fancy goldfish will be my choice. Pretty dumb decision isn't it?
 
Mostly cories, some clown loaches, dwarf neon rainbows, rams, apistos...

When I bought him, my DP was in a 29g with about 30 others and a male guppy. Completely bare aside from the gravel. No one had nipped fins, they were all just kind of floating around looking at the surfaces. At home he's in a 15g with 3 black kuhlis and a nice male guppy, no signs of any agression... So on that note, I say if you can find peaceful dwarf puffers, get a couple dozen of them. :D
 
You could check out the International Aquascaping Contest, they have different categories depending on the size of your tank. Some of the smaller ones look really great I think.
I personally would go with a completely non-aggressive tank, and as far as smaller fish go, you could get huge schools. Bottom feeders, top feeders, middle feeders. I bet a whole bunch of bright (female) honey gouramis would look amazing.
 
I would probably leave the water level somewhat below the rim, so I could have some floating plants and plants above the waterline. Then I'd add small fish :D. Marbled hatchets, glowlight or rummynose tetras, lemon or serpae tetras, otos, cories, a dwarf cichlid species, bulldog plecos.

No big fish for me. I always start to think of what kind of sauce I'd like with them when I see them ;).
 
Bichirs and a big school of Congo Tetras or a breeding colony of Jewel Cichlids is what I would do if I didn't make it a saltwater setup 1st. ;)
 
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