This pattern is very easy and quick to tat up. I've made these in size 10 crochet cotton for Easter or Christmas gift tie-ons.
clover: R 4-5-5-4, R 4j5-5-4, R 4j5-5-4
chain: 5-5 join to any hole of button 5-5
ch: 5j5 join to next hole in button 5-5-5-5
ch:5j5j5j5 join to next hole in button 5-5
chain: 5j5 join to last hole in button 5j5
tie into base of clover and finish off.
Adjusting the tension in the chains so that it "sits" right can be a bit tricky. I haven't found any perfect solution for that though...
I've also made this into a pendant (with a tiny mother-of-pearl button) - just attach a jumpring to the top picot, and run a ribbon through it to hang.