I've got 3 different 5-colour decks:
- Slivers
- Planeswalkers (currently on about 28 PW's and still looking for room for the new Ajani and Garruk, it'll become problematic when Commander 2014 is released)
- Sideboard.dec
There's an upkeep.dec currently in the making.
The fun thing is: people know I have a Sliver-deck, so I always grab Sliver Overlord as my general for all 5C decks. In the beginning, people were confused why it took so long for the slivers to come out.
Btw: all of the decks are free of fetch, shock-duals and original duals. Green and artifact-fetch are all good enough and Exotic Orchards, Command Towers, Vivid lands, triple-lands etc. are good enough for me.