Too much mulberry is a bad thing . If you're using it as a mat, don't also use it as a border. Allow to soak in until paper is saturated, then gently pull the pieces apart. It's also more precise. Just fold along the line you want, lick the edge of the paper and gently tear it.
Some mulberry papers are more fibrous, meaning more big strands to work around.
Keep a pair of scissors around so you don't have to force the tear. Just snip and go on. You can use mulberry for any accent that would be soft, such as a snowman, a baby blanket or a pair of mittens. Green mulberry is great for grass. It doesn't have to just be borders and mats.