A transmuted Figurine of Power that gives a +1 to level, -2 to saves. If you made it like the Ring of FH and made it an Ioun stone, I could see that being reasonable too (ie no other ioun stones). If you make its cost similar to the Whetstone I think it would be desirable. I really like the idea of Transmuted Ioun and Figurines, as there are not many of them.
As for as Relics, for a Monk, I feel like it should be a Black Belt. I feel like it should allow him/her to auto-crit on 17-20 and a plus to str/ac. Each relic should reflect the classes uniqueness and for the Monk I think that should mean it either grants immunity to something or make Flurry of Blows/Stunning Strike better.
For Ranger, a relic bow that lets you shoot two arrows a turn. You could make a Rare arrow of quick shot that would have a damage circle on it as a one time use. Then the Relic would allow you to use the second puck to shoot that as a free action per turn, without a one time use. You already have the puck, so no extra equipment is needed.
For the Barbarian, a healing two-handed Axe of Slaying, bonus to str, heals 1/4th of damage dealt, cannot change to a ranged weapon.
I would think with the charm and ioun stone this year, I don't really see the need for a tressure enhancer anything next year. Those should be sparse.
"In order to make a man or a boy covet a thing, it is only necessary to make the thing difficult to obtain." Mark Twain