I had purchased these circles from CTMH with full intention of using them for the spotlight technique. (I will not disclose how long ago I made this purchase, for fear it will really showcase my hoarding problem! But I will say I have not had them as long as the stamps!!)
To get the color only in the area where I needed it to be, I punched a 1 1/4 inch circle out of some scrap paper. I used the paper with the circle hole in it as a template, laying it over the image and colored within the circle. It worked out really well!
I really like these circles, because they do seem to pop the image!
When I proudly showed my creation to DH, he asked "aren't you going to color the whole thing?" **sigh** I don't think he will ever "get it"!