1) I've started working on stealth music and I've found it to be pretty enjoyable. The ones you hear from Call of duty missions(some of them), Hitman soundtracks, splinter cell maybe etc..
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Call of Duty 4 Sniper Mission Music
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Stealth Music - Space
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Assassin's Creed 2 OST / Jesper Kyd - Stealth (Track 25)
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Stealth Music - Silent Assassin
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Hitman: Blood Money OST - 07 - Amb Zone
2) Skipped the post apocalyptic since it was the latest contest's theme.
3)Maybe a themed rap beat(industrial, gangster, horrorcore etc...). Composers can rap on them if they want to and this should be very fun imo
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F*ck Haters
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Best Rap Freestyle Battle Hip Hop Instrumental Beat
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The Game - My Life (Instrumental) Rap is not just violence, emotional ones do exist such as this ^^
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Eminem - Stan Instrumental
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Tech N9ne - Fragile Instrumental
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Outsider - Loner (Instrumental)
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Twista - Mr Tung Twista Instrumental
4)Umm.. what about Christmas themed music? Since it's that time of the year

The examples I'm putting are not mainstream Christmas songs you guys should check them out

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Christmas Eve/ Sarajevo [Timeless Version]
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London Symphony Orchestra - Joyful Music for Christmas
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Trans-Siberian Orchestra - Wizards In Winter (video)
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Beetle Juice Theme Song (I thought I could put this song under this theme since it sounds a bit christmas-ish

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Figure - Beetlejuice (Dubstep Mix) (This is the previous one's dubstep mix as it says, an awesome one too)
5)Putting steampunk in again might be good. I still think this would be a hard theme tho

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London, 1856 - A Steampunk Orchestra - Epic Adventure Music
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STEAMPUNK & VICTORIAN ERA Orchestral Music Compilation | 2-Hour Epic Mix
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01 Discombobulate - Hans Zimmer - Sherlock Holmes Score
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Epic Orchestral Steampunk Music - Of Fire And Steam By Michael Ghelfi
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03 I Never Woke Up In Handcuffs Before - Hans Zimmer - Sherlock Holmes Score
6)Future Garage music or some may refer to inspiring moody songs to them Here are some examples:
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Aaron Static - I Won't
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Alivvve - Eternity(This is ambient music actually but i've found it during my search so im putting it in here)
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Phaeleh - Should Be True(This guy makes perfect music

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Tom Day - Who we want to be
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Tom Day - Going Home
1) Enlightenment: a piece depicting the excitement of discovering/learning something new. Such as a man seeing an angel, a group finding a huge alien settlement in a far away planet, a nordic warrior fainting and seeing Thor telling him something and he wakes up with a godlike power and enlightenment on the battlefield etc..
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Krale - Island of Enlightenment (Epic Oriental Beautiful Uplifting)
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HENRY PURCELL (1659 - 1695) Orchestra of the Age of Enlightenment (2007)
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Alliance - Above All [Uplifting Orchestral Music]
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"SOUL STORM" Worlds Most Powerful Inspirational Epic Orchestral Music - 6 HOURS - Audiomachine (this one's a bit long :'P )
2) Fairy Music: This one just came to my mind. A piece expressing a fairy world with pixies, talking rabbits, ponies, wizards etc. This can be narrowed down with only one theme chosen.
This genre wouldn't be my favorite to be honest, but an idea is an idea

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1 Hour of Beautiful Fairy Music
3) Pirate Music: Self explanatory i guess. I'd vote for the more action or uprising style of this genre, rather than sad pirate songs.
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World's Most Epic Pirate Music Mix | 1-Hour Mix
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ALESTORM - Keelhauled (Official)
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Epic pirate music - Destination Tortuga
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Pirate battle music - New Horizons