well there are a lot of tapping parterns that were popularized by Van Halen, including tap-pulof-pulof, tap-pulof-hameron..

e|--t12--p5--h8-----------|

e|--t12--p8--p5-----------|

e|--t12--p5--h8--p5-------|

e|--t12--p8--p5--h8-------|

these are just few examples of the Van Halen, I'm sure you can think of many more..

also there are advanced tapping and more complicated than this, for example, the 2 handed tapping like Joe Satriani's 'Midnight' ..

some people like Michael Angelo Like to combine Tapping & Sweeping, which is simply SweepDown-Tap-PullOff-SweepUp...

Also check out Steve Vai's Tapping style, he's just amazing..