Spellbreaker: Absorbs some damage from spells (if you block them with it). Damage is then stored in the sheild, and if you use shield bash it lets out all of the spells thath you absorbed (although with lower damage/effect). To balance it out, there should be a cap on the damage/effect of the spells released, and the amount of spells that can be absorbed. Another effect could be that it temporarily stops enemies from using magic/drains magic if you use shield bash with it.
Saviors Hide: Higher resistance against magic and poison, higher base armor, resistance to enchanted weapons. It should look a bit more rugged and should be the same color as Sinding. It could also be powered up by killing animals (a bit like the ebony blade). This effect would have to be controlled, one way would be that killing higher difficulty animals powers it up more than killing easy to kill animals.
The Ring of Namira: This should just have a cool effect, its current effect is pretty good but not really interesting. (imo)

I would like to see large dungeons or ruins to explore that are one of a kind. For Mehrunes Razor, maybe you would have to do a bunch of extra archaeology quests to gain Silus's trust, and then explore some ancient temples to get each piece (guarded by mythic dawn members). I get tired of exploring caves that are similar over and over again