There is a very sensible and balanced article in The Catholic Herald by Sean Tribe, entitled: In a year Pope Benedict XVI has reshaped the liturgical landscape, have look.
It is interesting that 10 years ago, 5 even, liurgical experiment generally meant liturgical abuse. There are still bishops or priests using pottery chalices, discarding vestments even making up their own Eucharistic Prayers or sitting around a coffee table but I think these things are rare and becoming rarer, rarer still, thanks to the blogs, maybe, are clown or puppet Masses. Those who carry out these things know they are abuses and younger priests refuse to take part in them. Today everyone knows these things are wrong. They still happen, they distasnce people from the Church, thwart the work of ecumenism with Orthodoxy and frighten dissident traditiomalists.
Liturgical "experiment" nowadays seems to be about the use of silence, not microphoning the Eucharitic Prayer, finding ways of using the General Intercessions so they are not the most tedious part of the Mass.
I was talking to a priest recently who was planning to experiment with a children's Mass, using the Low Mass in EF with hymns and prayers led by a deacon. He was trying to unite what they understand by prayer with praying the Mass.
Other experiments I hear of in the OF are the reintroduction of chant, using an increased amount of Latin, using a quieter voice for prayer, even looking towards the crucifix at the doxologies of collects etc. Here, we have introduced a twice weekly ad orientem Mass.
The good experiments are those which involve an intelligent reading of the rubrics and conformity to them, with a strong reference to tradition and continuity, rather than rupture and doubtful archeology.
I don't want to hear about horror stories but I would be interested to know about good experiments.