Dunno, maybe over a year with PDN but not much toying, not serious, only sometimes until last June when somebody on Facebook asked to me design a banner so that's when I became more familiar with the tools.
I got serious, did my experiments with 3D art, primarily relying on stuff like Gaussian Blur, Gradients, Bevel Selection, Outline Object, Drop Shadow, Shape 3D, Clouds, Dents and AA's Assistant. Those are the things I used to create the greeting card objects. I had to manually draw a lot with a brush and the line/curve tool. I love what I did with the bell, the gingerbread and the snowman.
Thought I'd impress my Facebook friends with it...