I made this quick and super simple DIY birthday card for my father-in-law earlier this week. I've attempted watercolor lettering in the past and have decided it's one of those things I'll need to take lessons for because it's incredibly difficult. In the meantime, I've found a little cheat to make it look you have awesome painting skills and incredibly steady hands. All you'll need are washable markers (Crayola works), a thin paintbrush, and water.
On a card or paper that is watercolor proof, letter using the markers. Next, dip the brush into water and lightly paint in the letters using water. If the water beads and sits on the paper, give it a few minutes to soak into the paper and create a watercolor effect.
After the water dries, you can go in and redo the lettering to add even more of a watercolor effect. The end result leaves you with a beautifully lettered card that leaves everything thinking you've got major skills (which, you do).
