At risk of being provocative I think the Shard looks fantastic in the photos! Whilst out and about the other day the Shard looked wonderful bouncing the light back onto the streets of SE1
I suspect I would feel differently if it intruded onto my living space in an unwanted and inescapable fashion.
A suggested short term solution might be to look away from the shard or to part close curtains/blinds until the sun moves around? A longer term solution would obviously be for the shard to be demolished or encased in a non-reflective material.