The instructions are shown on each printable box and are pretty easy to make. These will work best printed out on full sized (A4) card stock (paper will be a bit too flimsy) and you'll have to set your printer margins to the minimum.
While cutting out the template be sure to notice the fold lines, they won't be on the cut-out so you will need to keep the rest of the paper for reference. Also the cut lines I've marked are faint so that they don't show up on your finished gift / trinket / party favor box but will hopefully be clear enough if you look closely. Also be careful to only cut the folding tab line to the square in the center not past it.
To make the folds nice and neat either use a folding tool from your local craft store or if you don't have one handy I've found a butter knife can work quite well.
This cheerful little box is a vibrant blue and is decorated with colorful party balloons, a birthday hat and noisemaker and says "Happy Birthday" on the sides. There's a matching birthday party invitation card and envelope so it might make a nice set if you want to have a matching party favor box.
A light pink and burgundy box with a retro looking birthday cake on the top clasp sides. Same as the last one, there's a similar birthday party invitation card and envelope for this box.
Decorated with colorful stars that are still light enough that you could add your own personal message on the sides and a big blue on the boxes top that says "Happy Birthday".
This is the same as the last one but the stars are much more vibrant. If you're interested in one without anything written on top, there's a matching on in general purpose boxes.
A pretty, pale orange with swirls and stars along the sides and a big, bright star on top that says "Happy Birthday!". This might be nice for an adult or a teen since it's a bit more grown-up than some of the other boxes on this page. This page has the matching one with nothing written on it.
It's really hard to see how this gift box looks in the thumbnail so click through to see how it really looks. This one could be nice as a baby's first birthday since the light colours are very soft but it would also be nice for kids or even some adults.