Scriabin is not hard to play? You must be kidding me.

Waller's Jitterbug Waltz
Ellington's Sophisticated Lady

I think you can make simple music look harder simply by the way you play it. My hands are naturally quite flamboyant when I play, and if I exaggerate this it can seem to the unfamiliar like I'm doing more than I actually am.

The Chopin Raindrop Prelude is pretty easy if you are at a grade 6 standard. Its fairly familiar to most people and has a good contrast of light and dark sounding themes.

Scriabin Prelude op 37 no 1Scriabin Album Leaf op 45 no 1
Bach Sicillene from Organ Concerto in D Minor op 3 no 11
the one Volodos plays.
The most accessible Rachmaninioff piece is probably Moment Musicaux op 16 no 3 (was grade 8 in 2009)
If you can reach the chords its not too bad. All the rest of Rachmaninoff is way harder.

in my list, the longest is like 3 pages, technicaly accessible to a grade 6 nothing to hard, all though to play them in the right style you need quite mature emotionally to "feel" the music. I would say those pieces are grade 8 ish with the Bach being technically quite straight forward.

http://www.youtube.com/watch?v=jhWGINMYrSU
http://www.youtube.com/watch?v=RaFBVfwyoiY
http://www.youtube.com/watch?v=2I26LJnIhQA
http://www.youtube.com/watch?v=NDVprKqqB8A

The Rachmaninoff you need to be able to reach a good tenth espically, which I assume most adults can. I can do a good 11th from the G below middle C to the C above middle C with left hand with notes inbetween.