They are exactly what they look like...candy hearts stuck to the wall.
I have another great photo that shows them stuck to the cube wall but its having a hard time findingits way to my blog. Here they are on the cube wall.
Here is what the back looks like:
And now for the tutorial:
Candy hearts (I sorted through the bag and found ones with clear writing)
Glue (I used a hot glue gun)
Step 1: Turn the candy heart over
Step 2: place a dot of glue on the back
Step 3: place thumb tack on glue
Step 4: let it dry
Step 5: Stick to wall in any pattern you choose :)
Note of caution: Make sure no one tries to eat them. The glue could be toxic and the tack might be tough to digest. Licking of the wall is left up to your discretion.