Yes, there are larger Tetras, but most have realy bad attitudes. Corries are another option, but require a mature tank (cycled isn't good enough for them
). The difficulty with 60l tanks is centre piece fish, as most colourful fish will grow too large for that tank
You may get away with a pair of dwarf cichlids, say some apistogramma if your water is soft, or some keyhole cichlids if the water's hard. Other than that I don't realy know what to surgest.
It may be an idea to go to your LFS, and look at the fish they have on offer again. Look for something that catches your attention, and jot it's name down. Once you have a list, come back here and ask about them. You may find a fish small enough for your tank that I have forgotten about.
Bettas are a possibilty, but they are hard to mix. Tetras will usualy nipp them, danios will stress them with their quick movement and most fish that aren't live barers will outgrow a tank of your size if they are compatible.
Guppies, Plattys and Swordtails may be worth looking into. Don't bother with mollies as they need Salt to do well long-tearm IME. With live barers though, you will be over-run with babies, so look to see if your LFS will take some off your hands at a later date, or ask for all males. Females may be pregnant upon purchase, and can have numerous lots of fry from one mating, thus the possibility to still be over-run with fry is still there.
All the best
Rabbut
Edit: for spelling