Looking for a simple but effective outline design for positive and negative masked monoprints I considered the following: candles and lighters, various small birds including swallow, hummingbird and the like, sharks, flowers and eagles.
Being left-handed I tend to draw from right to left across the page which stops my hand smudging previous sketches.
The first candle, top right, is too static and inorganic. 
The second attempt, once made into a silhouette, isn’t terrible exciting. I love the left hand design, but cutting those thin lines out and working in both positive and negative would be a challenge and not suitable for this project. So that’s a no today but it might be possible to use further down the track.
What about a lighter and flame?
I got a little carried away with the drawing detail but realised when I got this far that, again, the shape was not very interesting. 
So I didn’t bother adding the flame and abandoned this idea. I moved to subjects showing movement and was quite interested in a hammerhead shark but the proportion between positive and negative space was poorly balanced. 
The image was too solid with not much definition.
Birds were another option, as were soaring eagles.
I’ve decided to enlarge the bottom left hand eagle and see how it sits on the print plate.
Not bad but I’ll move it slightly to the left. I then reversed it and placed it on top of my experimental stitched print.
Quite honestly I’m happy with it flying on either direction.
I’m ready to cut several positive and negative templates.
TactualTextiles 
Can’t beat nature for inspiration.