2. Watercolor Colored Pencils... I use Prismacolor and Derwent and they're both wonderful... I use these more as a base for my shading... I put down a layer and then blend with water. I then go over it with different glazes of acrylic paint until I get the color that I want. I love it because if I don't have the exact color I want I know that all I have to do is add some more layers of color glazes until I get it just right (that's if I don't completely muddy up my colors first... haven't done it, yet, but there's a first time for everything)...
3. Gel Matte Medium by Golden... I have a lot of glue around my studio, but this is my favorite for mixed media pieces... and the part I absolutely love about it is that your application doesn't have to be remotely perfectly... just glob on a chunk of it, place whatever paper or 3D object on top, and messily smoosh with a brush... it's not perfect, but when it dries it sure looks like it is...