Ambient minimalist case..a tip for empty 6hp

Hi guys, I created this little gem for some ambient... I'd like some ideas on how to fill those 6hp.?
I was thinking of a 4hp filter like Viol Ruina, but your ideas are welcome!

Best wishes at all

EDITED Today, 15:18

oooooo the ADDAC604 would be perfect for all the stereo stuffs!