What to do with bland corners?
Since you have the natural light from the flanking windows...how about plants or trees...or taller floor lamps?
Theres always corner curio cabinets for displaying ...some of which hang on wall rather than floor standing so they wouldnt compete with what ever furniture you have there...and there is actually cool wall art and sculptures that are designed to hang/fit into corners. And also grandfather clocks made for corners. Ive also seen pairings of taller/narrow framed art hung staggered on each corner wall. If you have chairs in the corners...perhaps a small table behind it with a ornate lamp and shade...many ways you could go. Good luck with your decorating.