I'm giving it a go experimenting with Prismacolor Pencils and have colored an image from Summer Fairies by Pergamano. The one on the left shows the coloring using the pencils only and the one on the right shows the result after blending.
I blended the dress and flower with a paperstump pressing really hard. The rest of the image with blended with a Prismacolor Blending Pencil which you can see clearly in the hair and bird. I didn't find too much of a difference between the two blending results, although, I had to press down slightly harder with the paperstump.
Main Stamp: Summer Fairies (P)
901, 902, 908, 911, 913, 915, 917, 918, 931, 932, 934, 941, 942, 945, 946, 956, 961, 962, 991, 995, 997, PC921, PC1022, PC1021 and Light Flesh