Mash-ups are go. We Tell Stories - 'The 21 Steps' by Charles Cumming. How to create basic mashups with Yahoo! Pipes. I’ve blogged previously about what Yahoo! Pipes can do. The following describes some of the basic mashups you can create with Yahoo! Pipes – please add your own tips in the comments. Signing up First you’ll need to go to pipes.yahoo.com and register with the page.