on my stamping retreat i experimented with gelli plate + packing tape, as shown in this Video on YouTube: https://www.youtube.com/watch?v=ZNNboYneDAc
i really love the results, but you should bring along some time and other things to do in the drying times between the steps... it takes about 3 hours to build up the layers.
(as the first one i show has a lot of pink in it, i also link it to take-a-word)
when ready, you can glue the tape onto a double sided tacky sheet (as above; so you can decide later where to use it)
or you can instantly glue the packing tape onto paper (here: Music sheet):
or onto Aluminium foil (the scanner doesn´t take that well):
and another one - with purple/green Color scheme: