Both of our grands have Irish surnames, so shamrock shirts are in order. I found this idea on Pinterest (how on earth did we ever manage before Pinterest?). There is a detailed tutorial on Jessica's blog. The technique is pretty similar to the Sharpie mugs we made at Christmas, except we're using paint, not Sharpies.
The hardest part of the project was finding plain white tees ! Target had all kinds of printed ones, a bazillion Frozen ones, and only these two styles in plain white. I washed and dried the shirts first so they would do any shrinking or other laundry bad-behavior before I painted them. Washing also removes the sizing used that makes the shirts look all smooth and perfect - it also can prevent the paint from sticking.
First, the shamrock. Jessica has a template on her bog, or you could free-hand it. I used her template and enlarged it to about 120% for the larger shirt. Trace the template on to freezer paper. Freezer (or deli) paper is key.
I used two shades of green paint, plus one with glitter to glam up the one for Montana granddaughter. Since I used regular acrylic paint, not fabric paint, I added texture medium . Fabric paint, or acrylic paint with texture medium, helps the paint be absorbed into the fibers and be more permanent.
Now the fun begins. Dip the eraser in paint and start painting dots all around the shamrock. Paint the dots close together at first, then start spreading them out a bit as you add more rows. The first couple of rows closer together ensure a crisp outline.
Here is the little shirt fro Texas grandson with all the painted dots and the paper template still in place. Once you're happy with the dots, peel off the freezer paper. The magic of freezer paper is that it will peel off without leaving any residue. Let the paint dry for twenty-four hours.