Yeah, if it's just the thin aspect you're looking for, I'd give taslan (which is coated nylon) or nylon a go. Taslan comes is some really bright colours and is definately pretty thin. I'm not sure if you'll have the same trouble with wetting out as I have with the dermoflex diapers I made.
I have found that my dermoflex diapers work pretty well if I get them stuffed well. I made my new inserts out of 3 layers of terry that allow my dermoflex pockets to last as long as my PUL before they wet out.
The dermoflex is a bit bumpy on the coated side, it's tricky to get small inserts into the small diapers since I have to get my hand ALL the way in. Still though, it's definately thinner than PUL. You can get both dermoflex and taslan at wazoodle you can see their sticky in the resource thread (warning: DO NOT buy wazoodle's wierd PUL...) Let us know what you use and how it works out when you're done!