LOL, Ann! Lucky you! All the bottles I'm finding are empty & they didn't contain ink. Darn!
The 'shaving cream' technique had some popularity a few years--10 > 15
--back. I think it
was done with pigment inks (liquid &/or pad). When I saw it I had lots of shaving cream, but no pigment inks. It's a fun technique.
Thinking about it now, I'm not sure it wouldn't work with alcohol & dye inks. With all the attention lately to BGs, lots of these 'old' techniques are making the rounds again. And stampers are combining them with other techniques like heat-embossing & fussy-cutting.
LOL, Jan. That 'Dee' was Ms. Gruenig (Posh Impressions). Dee has retired, but her images & style helped lots of stampers free-up their way of using stamps & color.
Back to your question, Ann... When in doubt? Explore & play! Look upon your 27 bottles as a buried treasure. Get some dense foam/felt & ink up some of your stamps &/or fingertips (use the GS's). Add a dash of your embossing powders for good measure. See what happens & don't sweat what doesn't 'work'. Heck! Tom Edison tried a couple of things before he found a material that worked for his first (successful) lightbulb--& he wasn't even the first person to come up with electric lights. He was just the first one to make it available to the marketplace.