Also...you might want to check back at Ranger's blog at around 4 pm EST. Just saying. ;)
I use the Paint Combs constantly. I love the straight side for gesso-ing quickly. I just used it to gesso this 30"x40" canvas yesterday. It makes short work of a tedious gesso job:
Tip: while your gesso is wet, press the comb into it several times. This gets a slight texture into the gesso and the paint will look sooooo cool on it later.
After the gesso is dry, I added all kinds of color. Basically most of the colors in my Dina Wakley Media line barfed right onto the canvas (hahaha). Then I sprayed the colors with a bit of water to get them to meld and mingle. While the layers were wet, I pressed the comb into the paint several times, letting the colors transfer between each press. Ooooooh I love, I love. Can you see the comb texture in the gesso on the right? Cool stuff.
This is how the canvas looks now. Not sure if I'm done. I'm going to let it sit today and work on it again later.