I love washi/tissue tape, too.
I buy some ready-made but I also love to make my own using tissue paper and double-sided tape because I can make it custom to match any project that I'm working on and it provides me with yet another opportunity to stamp and play around with my inks and color sprays.
So if you enjoy stamping and playing around with ink/paint/mists, I'd encourage you to give making your own a shot. I think I first saw the tutorial re: how to do this from Julie Ebersole.
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"May your mind whirl joyful cartwheels of creativity." - Jonathan Lockwood Huie.