Oh, I have something fun to share with you...a little messy but fun.
Using this idea of Bubble Painting, which is wonderful for kids but I want something for me using Stampin' Up! supplies. So I used ink refills in the bubbles on Whisper White cardstock and it worked great! I made these cards back in May.
I think I used Island Indigo and Pool Party ink refills...don't recall how much just added until it came out like I wanted. After placing cardstock on top of bubbles I would dab off with a paper towel and then do it again until I had the coverage I wanted.
I hope you like this idea and try it out yourself.