I awoke this morning with an image floating in my mind from a dream of what to try next with indigo and here it is after the dipping. I will be working further with this once it's dry. And I got a vat that I'd used to dye with blue glue gel resist up and running again, so I dipped a few more:
Words, patterning or any drawing is now possible - although the vat does exhaust quickly so I will continue trying other resist methods as well - but I am able to get it back to a useable state.
And another experiment - masking tape! The patterns all showed up but it works best when the tape is on both sides, as it was with the bottom piece.