-large heart punch (mine is 2 and1/2 inches, from Micheal's, around $10 after 40% off coupon)
-jute twine (just in case you didn't know, and I didn't, this is with the jewelry making stuff at HL)
-decorative scrapbooking brads (called "Spare Parts" at Hobby Lobby. I bought 1/2 inch ones. $1.50 at half off.)
-paper ( I bought five different ones, and only ended up using four. You will only need one sheet of each to make an approximately 5 foot garland.)
-standard hole punch
I decided I preferred the way three leaf clovers looked over four leaf ones. Clovers still represent St. Patrick's Day, and I don't believe in luck anyway! So, I punched out three hearts for each clover, and then free handed a little stem pattern. Your stem will need to be longer than you think, since part of it will be covered by the leaves.
Then I stacked three hearts together and pushed a thumbtack through them close to the bottom of the heart. The brads I bought weren't sharp enough to go through that much paper on their own, so this helped to get them started.