I have two "greek column ruins" decorations (both from Petsmart iirc), some smooth river stones that I got in "Bag of Random Rocks" from Michaels, a pretty stripey rock that I don't recall the origins of, a moss ball (live), a java fern (I think it's a java fern, it's been in there for months and hasn't croaked yet), a "bunched water plant" the one in the back right of the tank...it's got roots coming out all over the place and seems fairly happy also, a banana plant (love them!) and then that big fluffy silk petco plant has now been replaced by a big fluffy live sword plant. Natural gravel, no filter, 25w nonadjustable heater lurking in the back.
Dunno what the magic is about this tank, but it's always crystal clear! I just jinxed it, didn't I.