I'll guess since you mentioned lighting and stuff that you are basically looking for plant suggestions... There are just too many for me to think about and I only know a few... Personally I am cheap/poor and have some basic low light. So my options are limited but I am quite fond of some of the low light plants like hornwort. I also go for the cheap bulbs at Walmart and those don't look as bad as some people might imagine. I can't offer too much for plant suggestions but personally I would add some driftwood and maybe some java moss or something attached to it. But that's just me... I think just about anything would look good behind what you already have... Hope you get a chance to share some pictures.