Here is the tutorial.
She was using colored pencils, mineral spirits and blender stumps, but I used my watercolor pencils and the blender pen, and I thought that worked fine also. I'm thinking that a similar process would work for markers--I'm saving up for a set of Copics, and so I'll have to figure out how to use them!
On another note. I've come to the realization that I couldn't possibly afford to own all the sentiment stamps available (I could try, though!!), so I thought I would work on my handwritting a bit. (My third grade teacher would be proud!) I suppose I could use the computer, but I'm trying to get away from the computer, since I make my living working on it. . . so, here's my inside sentiment that I lettered myself.
I was surprised to find that lettering wasn't really that hard--I just practiced on scratch paper for a bit and came up with my own font of sorts. I did study a bit of caligraphy out of a book when I was a teenager, so that kicked in, I think. Maybe I'll go check out a book on caligraphy--it might be fun to try again. The stamp set I used on the inside is SU Noteworthy. Anyway, I'm continuing to learn as much as I can and having fun in the process!