There are some mutations that don't seem to fall neatly into the recessive or co-dom categories and appear to have sporadic visible hets. In ball pythons piebald seems to be this way with many (some estimates as high as 80%) of the hets having a clear lower belly with dark solid stripes at the edge which looks like the pied pattern starting to develop. The problem is it varies in quality, not all hets show it, and some non hets show something similar. But to show up as often as it does in het pieds it does seem to be a co-dom tendency of the mutation.
There have been less well documented rumors about other "recessive" ball python mutation that might show in some hets but piebald seems to be the best example so far.
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