Right now I'm feelin particularly inspired by these Rodney Matthews pieces and their odd feeling. A Matthews inspired campaign might be interesting. Giant mushrooms, weird skull mountains, insect dudes wearing robes, huge trees, unearthly flowers, crystalline cities etc.
This first piece is an illustration from the Michael Moorcock novel The Champion of Garathorm, which I recently read, and whose protagonist is Ilian of Garathorm the only female incarnation of the Eternal Champion featured in one of Moorcock's novels.
And how about some Roger Dean too?