I recently saw a few early Tim Burton animated shorts films. Most are 2d, you just have to scan down the list, like number 13
https://www.youtube.com/watch?v=y_W_...fFrKJ5&index=7
Also, I'm sure you've seen "REJECTED by DON HERTZFELDT"? If not, it's very creative 2d animation, more hilarious and gross than scary:
https://www.youtube.com/watch?v=W7JyjZI3LUM