I am a huge fan of happy accidents! and love when the happy accident ends up spawning a whole new direction and eventually a solid new addition to your portfolio
when inspiration dwindles for me I like to get completely away from producing and be creative in another medium but in a very relaxed and non-demanding way...I usually find this via my day job as a cook/chef as culinary arts is a passion but one not as intense as music....I used to find it with poetry and prose but words/language got to be too confusing and imprecise for expression as music/sound became my medium of choice....
reading a favorite poem or quote or personal mission statement or watching a certain movie/scene from a movie or hearing a song from a genre I never work in are usually dependable ways to get little spurts of determination and inspiration going....like tonight I heard that track by Eminem that was used in "8 Mile" where he talks about there only being one chance to make it and you have to take advantage and fully live the moment and the music, and it made me want to get to work on my music as soon as I could (I was at work).....
or lately, I just watch cartoons and drink beer till inspiration knocks again...