I favour bigger picks as they are easier to hold. Celluloid picks don't last long, so I began to make picks from old credit cards. These are quite rigid (thicknesses do vary slightly), and with patience you can produce various profiles. I made a stainless steel pick - you have to really pay attention to the final smoothing. These give a bright sound, while loosing low end I found. The drawback is that they ruin pickup tops and scratchplates if you are not very careful.
Here's a few credit card picks in various stages of completion. I used Gibson heavy picks exclusively for years, but these last longer and grip better.
