Sometimes there is such an easy solution to a new 'need' ...
After having seen the Japanese washi tape in various oversea online-shops, I wanted some of that colourful tape myself too - but as so often, the shipping costs are exorbitant.
So how could I make a similar tape myself?
When visiting a construction/DIY market lately, I realized I might use a double-sided sticky tape (the thin, cheap one, is just perfect for this purpose). And it works! You can use it either for paper - wrapping paper, newspaper, mulberry-, decoupage-, photos - whatever paper you like - or for light to medium weight fabric, or bits of trims and ribbons ...
Lay out your paper or ironed fabric backside up on the table, unroll a bit of the double-sided tape and gently press it down, avoiding wrinkles, unrolling more of the tape as you go. Cut it off in a manageable length.
Now you can either use a roller cutter or craft knife and a metal ruler to cut the tape lengthwise in the strip dimensions you prefer - or you could keep the width of the double-sided tape and just cut off short strips from there whenever needed.
A toilet tissue roll and a paper clip will keep your fancy tape organized.
(On the second photo, the two larger rolls to the left are actually self-adhesive wall paper borders which I found at a bargain - but they work as tape as well!)
(German summary: Eine einfache Art, buntes Klebeband selber zu machen, ist, dünnes, doppelseitiges Klebeband mit Stoff/Stoffbänder oder Papier jeglicher Art zu verbinden - dann entweder der Länge nach in dünnere Streifen schneiden und auf Papierrollen aufwickeln - oder bei Bedarf Stücke von dem breiten Klebeband abschneiden.)
*** I'm off for a week now - winter holidays at school - going to Sweden to see my family! ***