Normally this type of tutorials are more dedicated to design with Photoshop, but the truth is that a little material for Illustrator comes in handy, so vector lovers have fun.
There are seventeen minutes in which you will learn how to make a simple watercolor effect with Adobe Illustrator using the Blend tool.
Source | Crystalb
Hi, I did that effect, but I don't know if it was my computer or what, but
does not give the watercolor effect