If you can get hold of a bit of nice Dwarf 4-Leaf Clover, it can handle low light, is very pretty and spreads.
I've ordered it a couple of times but somehow only got regular, which is OK, but doesn't give the same effect - and wasn't listed as OK with low-light.
That and something small-leaved that spreads low might look really cool, but I swear the part of my brain that records proper names (and pretty much everything else) has eloped with the section that would have told me why I'm peering earnestly into the fridge...
Hard to make out if that's Bolbitis fern (assuming I'm spelling it correctly - this'll probably be some medical term for some unmentionable disease) tucked into the bottom of the driftwood, but if it isn't, boy, would some look nice.
I actually did get a bit of that earlier in the year, (lovely stuff,) but that and the Java Fern in the order both had black, hairy rhizomes so I didn't want to wind up adding any thing nasty (had BBA once and still wake sweating in the night) to any tanks and murdered it with peroxide and Excel, neither of which are supposed to be used on roots...
But if you were to have better luck, then I could live vicariously through you and your tanks, although I will also vicariously duck out of the way whenever the laundry basket's around...