Tissue paper is a very underrated material in artworks even when it comes to collage work. It is mainly associated with children’s art yet with care it can result in some stunning pieces. I like it for the layering of hues and richness of those colours although these days you can also get sheets of pastel shades too.
All you need is a white piece of card some glue, (I use slightly watered down PVA) some scissors or craft knife and a design.
You can use water to bleach the ink out of some tissue paper but not all as some are colour fast, or you can use ink or water colours to get the exact hue you want on plain white paper that I collect from things I buy in craft shops. As tissue paper is so thin, scrunching, tearing and ripping it can help add texture to your work. You can also make a form of collage impasto by applying the gluey tissue paper in tiny balls for a more 3 dimensional effect.
For more on how to use tissue paper to create artworks you might be interested in this link