Johnm's suggestions are good ones. John didn't mention that both songs he suggested are tabbed out in his book East Coast Fingerstyle Blues Guitar, in case you're insecure at figuring out things by ear (or just sometimes too lazy, like me!).
I'd been thinking of recommending Blind Boy Fuller's first recording of "Mama Let Me Lay It On You" and the intro to Fuller's "Piccolo Rag". Then thinking about John's suggestions, I realized that first part of the verse accompaniment to "I Crave My Pigmeat" are pretty similar to the last part of the accompaniment to "Mama Let Me Lay It On You", and the verse accompaniment of "Too Doggone Jealous" is really similar to the intro to "Piccolo Rag". So go with John's suggestions and you'll get mine almost for free.
I'd also like to suggest that the basic outline of Fuller's "Jitterbug Rag" isn't too hard to figure out - the last 4 bars run along the same lines as the first 4 bars of the "I Crave My Pigmeat" verse accompaniment, so try that after you've given Pigmeat a go.
