I have a 110 that I am trying to get around to setting up. I am going with a west African theme - Anubias, Bolbitis, Ammania, Crinium natans, Tiger Lotus all in fine black & maroon gravel, with the following: 2 Senegal Bichirs, 3 Leopard Ctenos, 2 African Butterflies, 1 Synodontis eupterus, 12 Congo Tetras, and 1 male and 3 female swordtails (live food production)
A couple of Reedfish could replace the bichirs, or an African Brown Knife, or some peocock eels. If you took the bichirs out, Debauwi cats would be neat.
Or you could go Amazon - Angels, Hoplo and Banjo cats, Diamond tetras, Hatchetfish, couple 2 or 3 small to medium plecos.
Or you could go with a couple of Oscars or an Oscar and a Jack and a pleco.
Or, if you have a nice quiet place to set it up, plant the hell out of it and put in 3 to 5 moonlight gouramis, 8 or so Glass Catfish, some ottos, a shoal of cories, and some low key tetras or rasboras - say glowlights or Kerris or Emperors, and a farowella cat.
A low end brackish tank with an arogonite sand bottom, one or 2 violet gobies, and sailfin mollies, say 3 males and 12 females. Maybe some knight gobies or a freshwater moray to clean up the fry.
Or build a tank around an Indonesian Datnoid.
Snakeskin Gouramis, Clown Loaches, and Scissortail Rasboras
200 neon tetras, 12 cories, and 3 bristlenosed plecos.
Light it with red and blue LEDs, install a DIY stryofoam back, bottom and sides to make it look like a cave, and fill it with Blind Cave Tetras, Albino Cories and plecos.
OK, that's my 10 cents.